diff --git a/.travis.yml b/.travis.yml
index cdd5b22..b066dd5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ php:
   - 7.1
   - 7.2
   - 7.3
-  - 7.4snapshot
+  - 7.4
 
 dist: xenial
 
diff --git a/composer.json b/composer.json
index acd56ba..1d9cd3a 100644
--- a/composer.json
+++ b/composer.json
@@ -17,11 +17,11 @@
         }
     },
     "require": {
-        "php": ">=7.0",
+        "php": ">=7.1",
         "microsoft/tolerant-php-parser": "0.0.18"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.4",
+        "phpunit/phpunit": "^7.5",
         "phan/phan": "^2.3.0"
     },
     "suggest": {
diff --git a/composer.lock b/composer.lock
index 205988c..ff0dd3e 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b73b7b9b0fc7897e204151a06d4ccde2",
+    "content-hash": "19c08422ce0965a299029e77dbc94bb5",
     "packages": [
         {
             "name": "microsoft/tolerant-php-parser",
@@ -51,24 +51,23 @@
     "packages-dev": [
         {
             "name": "composer/semver",
-            "version": "1.5.0",
+            "version": "1.5.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/semver.git",
-                "reference": "46d9139568ccb8d9e7cdd4539cab7347568a5e2e"
+                "reference": "c6bea70230ef4dd483e6bbcab6005f682ed3a8de"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/semver/zipball/46d9139568ccb8d9e7cdd4539cab7347568a5e2e",
-                "reference": "46d9139568ccb8d9e7cdd4539cab7347568a5e2e",
+                "url": "https://api.github.com/repos/composer/semver/zipball/c6bea70230ef4dd483e6bbcab6005f682ed3a8de",
+                "reference": "c6bea70230ef4dd483e6bbcab6005f682ed3a8de",
                 "shasum": ""
             },
             "require": {
                 "php": "^5.3.2 || ^7.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.5 || ^5.0.5",
-                "phpunit/phpunit-mock-objects": "2.3.0 || ^3.0"
+                "phpunit/phpunit": "^4.5 || ^5.0.5"
             },
             "type": "library",
             "extra": {
@@ -109,28 +108,28 @@
                 "validation",
                 "versioning"
             ],
-            "time": "2019-03-19T17:25:45+00:00"
+            "time": "2020-01-13T12:06:48+00:00"
         },
         {
             "name": "composer/xdebug-handler",
-            "version": "1.3.3",
+            "version": "1.4.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/xdebug-handler.git",
-                "reference": "46867cbf8ca9fb8d60c506895449eb799db1184f"
+                "reference": "fa2aaf99e2087f013a14f7432c1cd2dd7d8f1f51"
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/46867cbf8ca9fb8d60c506895449eb799db1184f",
-                "reference": "46867cbf8ca9fb8d60c506895449eb799db1184f",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/fa2aaf99e2087f013a14f7432c1cd2dd7d8f1f51",
+                "reference": "fa2aaf99e2087f013a14f7432c1cd2dd7d8f1f51",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.2 || ^7.0",
+                "php": "^5.3.2 || ^7.0 || ^8.0",
                 "psr/log": "^1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || 6.5 - 8"
             },
             "type": "library",
             "autoload": {
@@ -148,29 +147,43 @@
                     "email": "john-stevenson@blueyonder.co.uk"
                 }
             ],
-            "description": "Restarts a process without xdebug.",
+            "description": "Restarts a process without Xdebug.",
             "keywords": [
                 "Xdebug",
                 "performance"
             ],
-            "time": "2019-05-27T17:52:04+00:00"
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-06-04T11:16:35+00:00"
         },
         {
             "name": "doctrine/instantiator",
-            "version": "1.2.0",
+            "version": "1.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a"
+                "reference": "f350df0268e904597e3bd9c4685c53e0e333feea"
             },
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                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/a2c590166b2133a4633738648b6b064edae0814a",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/f350df0268e904597e3bd9c4685c53e0e333feea",
+                "reference": "f350df0268e904597e3bd9c4685c53e0e333feea",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "require-dev": {
                 "doctrine/coding-standard": "^6.0",
@@ -209,26 +222,40 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2019-03-17T17:37:11+00:00"
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-05-29T17:27:14+00:00"
         },
         {
             "name": "felixfbecker/advanced-json-rpc",
-            "version": "v3.0.4",
+            "version": "v3.1.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/felixfbecker/php-advanced-json-rpc.git",
-                "reference": "23366dd0cab0a0f3fd3016bf3c0b36dec74348e7"
+                "reference": "0ed363f8de17d284d479ec813c9ad3f6834b5c40"
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-                "reference": "23366dd0cab0a0f3fd3016bf3c0b36dec74348e7",
+                "url": "https://api.github.com/repos/felixfbecker/php-advanced-json-rpc/zipball/0ed363f8de17d284d479ec813c9ad3f6834b5c40",
+                "reference": "0ed363f8de17d284d479ec813c9ad3f6834b5c40",
                 "shasum": ""
             },
             "require": {
-                "netresearch/jsonmapper": "^1.0",
+                "netresearch/jsonmapper": "^1.0 || ^2.0",
                 "php": ">=7.0",
-                "phpdocumentor/reflection-docblock": "^4.0.0"
+                "phpdocumentor/reflection-docblock": "^4.0.0 || ^5.0.0"
             },
             "require-dev": {
                 "phpunit/phpunit": "^6.0.0"
@@ -250,24 +277,24 @@
                 }
             ],
             "description": "A more advanced JSONRPC implementation",
-            "time": "2019-09-12T22:41:08+00:00"
+            "time": "2020-03-11T15:21:41+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.9.3",
+            "version": "1.10.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea"
+                "reference": "969b211f9a51aa1f6c01d1d2aef56d3bd91598e5"
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             "dist": {
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-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/007c053ae6f31bba39dfa19a7726f56e9763bbea",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/969b211f9a51aa1f6c01d1d2aef56d3bd91598e5",
+                "reference": "969b211f9a51aa1f6c01d1d2aef56d3bd91598e5",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "replace": {
                 "myclabs/deep-copy": "self.version"
@@ -298,7 +325,13 @@
                 "object",
                 "object graph"
             ],
-            "time": "2019-08-09T12:45:53+00:00"
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-06-29T13:22:24+00:00"
         },
         {
             "name": "netresearch/jsonmapper",
@@ -348,16 +381,16 @@
         },
         {
             "name": "phan/phan",
-            "version": "2.3.0",
+            "version": "2.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phan/phan.git",
-                "reference": "cd72de4bde30606a8da3aaec7dd1b1ba365e8627"
+                "reference": "d458d8197b5b25bdca4c442be9a50321f0f8a15b"
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-                "reference": "cd72de4bde30606a8da3aaec7dd1b1ba365e8627",
+                "url": "https://api.github.com/repos/phan/phan/zipball/d458d8197b5b25bdca4c442be9a50321f0f8a15b",
+                "reference": "d458d8197b5b25bdca4c442be9a50321f0f8a15b",
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@@ -368,13 +401,14 @@
                 "ext-tokenizer": "*",
                 "felixfbecker/advanced-json-rpc": "^3.0.4",
                 "microsoft/tolerant-php-parser": "0.0.18",
+                "netresearch/jsonmapper": "^1.6.0",
                 "php": "^7.1.0",
                 "sabre/event": "^5.0",
-                "symfony/console": "^2.3|^3.0|~4.0",
+                "symfony/console": "^2.3|^3.0|^4.0|^5.0",
                 "symfony/polyfill-mbstring": "^1.11.0"
             },
             "require-dev": {
-                "brianium/paratest": "^2.2.0",
+                "brianium/paratest": "^4.0.0",
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             },
             "suggest": {
@@ -416,26 +450,26 @@
                 "php",
                 "static"
             ],
-            "time": "2019-10-14T02:32:36+00:00"
+            "time": "2020-02-20T14:53:46+00:00"
         },
         {
             "name": "phar-io/manifest",
-            "version": "1.0.1",
+            "version": "1.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0"
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
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-                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
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                 "ext-phar": "*",
-                "phar-io/version": "^1.0.1",
+                "phar-io/version": "^2.0",
                 "php": "^5.6 || ^7.0"
             },
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@@ -471,20 +505,20 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2017-03-05T18:14:27+00:00"
+            "time": "2018-07-08T19:23:20+00:00"
         },
         {
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-            "version": "1.0.1",
+            "version": "2.0.1",
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                 "url": "https://github.com/phar-io/version.git",
-                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df"
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@@ -518,28 +552,25 @@
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             ],
             "description": "Library for handling version information and constraints",
-            "time": "2017-03-05T17:38:23+00:00"
+            "time": "2018-07-08T19:19:57+00:00"
         },
         {
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-            "version": "2.0.0",
+            "version": "2.1.0",
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                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a"
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-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a",
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@@ -570,20 +601,20 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2018-08-07T13:53:10+00:00"
+            "time": "2020-04-27T09:25:28+00:00"
         },
         {
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-            "version": "4.3.2",
+            "version": "4.3.4",
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                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e"
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@@ -595,6 +626,7 @@
             "require-dev": {
                 "doctrine/instantiator": "^1.0.5",
                 "mockery/mockery": "^1.0",
+                "phpdocumentor/type-resolver": "0.4.*",
                 "phpunit/phpunit": "^6.4"
             },
             "type": "library",
@@ -621,7 +653,7 @@
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             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2019-09-12T14:27:41+00:00"
+            "time": "2019-12-28T18:55:12+00:00"
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@@ -672,33 +704,33 @@
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-            "version": "1.9.0",
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@@ -731,44 +763,44 @@
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-            "time": "2019-10-03T11:07:50+00:00"
+            "time": "2020-03-05T15:02:03+00:00"
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-                "sebastian/environment": "^3.0",
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