Update laravel support to include Laravel 7

Author: ollieread

composer.json

@@ -26,9 +26,9 @@
   },
   "require": {
     "php": "^7.4",
-    "illuminate/routing": "^6.0",
-    "illuminate/database": "^6.0",
-    "illuminate/validation": "^6.0"
+    "illuminate/routing": "^6.0 || ^7.0",
+    "illuminate/database": "^6.0 || ^7.0",
+    "illuminate/validation": "^6.0 || ^7.0"
   },
   "extra": {
     "laravel": {