Drop PHP5 support, Require Queue Interop with PHP7 features.

Author: makasim

composer.json

@@ -6,8 +6,8 @@
     "homepage": "https://enqueue.forma-pro.com/",
     "license": "MIT",
     "require": {
-        "php": ">=5.6",
-        "queue-interop/queue-interop": "^0.6@dev|^1.0.0-alpha1"
+        "php": "^7.1.3",
+        "queue-interop/queue-interop": "^0.7@dev"
     },
     "require-dev": {
         "phpunit/phpunit": "~5.4.0",