Support Laravel 7

Author: GrahamCampbell

composer.json

@@ -12,8 +12,8 @@
     ],
     "require": {
         "php": "^7.0",
-        "illuminate/contracts": "^5.5|^6.0",
-        "illuminate/support": "^5.5|^6.0",
+        "illuminate/contracts": "^5.5|^6.0|^7.0",
+        "illuminate/support": "^5.5|^6.0|^7.0",
         "graham-campbell/manager": "^3.0|^4.0",
         "pusher/pusher-php-server": "^3.3|^4.0"
     },