Adding support for Laravel 6.0

Author: alexpechkarev

composer.json

@@ -19,10 +19,10 @@
     ],
     "minimum-stability": "dev",
     "require": {
-        "php": ">=7.0.0",
+        "php": ">=7.2.0",
         "guzzlehttp/guzzle": "^6.3@dev",
-        "illuminate/notifications": "5.*",
-        "illuminate/support": "5.*"
+        "illuminate/notifications": "6.*",
+        "illuminate/support": "6.*"
     },
     "require-dev": {
       "mockery/mockery": "^1.0",