Laravel 7 support (#22)

* Laravel 6 support

* support for laravel 7

* update package requirements

Author: ibarrajo

composer.json

@@ -11,7 +11,7 @@
     ],
     "require": {
         "php": ">=7.2",
-        "illuminate/support": "^6.0",
+        "illuminate/support": "^6 || ^7",
         "jwhennessey/phpinsight": "~2.0"
     },
     "require-dev": {