Fix an issue with MimeType guesser and latest release of "symfony/http-foundation"

Author: okolesnyk

.travis.yml

@@ -1,6 +1,5 @@
 language: php
 php:
-  - 7.0
   - 7.1
   - 7.2
   - 7.3

composer.json

@@ -9,7 +9,7 @@
         "sort-packages": true
     },
     "require": {
-        "php": "7.0.2||7.0.4||~7.0.6||~7.1.0||~7.2.0||~7.3.0",
+        "php": "~7.1.0||~7.2.0||~7.3.0",
         "ext-curl": "*",
         "ext-dom": "*",
         "ext-json": "*",
@@ -27,8 +27,8 @@
         "php-webdriver/webdriver": "^1.8.0",
         "symfony/console": "^4.4",
         "symfony/finder": "^4.4",
-        "symfony/http-foundation": "^5.0",
-        "symfony/mime": "^5.0",
+        "symfony/http-foundation": "^4.4",
+        "symfony/mime": "^4.4",
         "symfony/process": "^4.4",
         "vlucas/phpdotenv": "^2.4"
     },