Added Laravel 7 support

Author: Andrey Helldar

Diff for: composer.json

@@ -17,8 +17,8 @@
     "require": {
         "php": "^7.1.3",
         "ext-dom": "*",
-        "illuminate/validation": "^5.6|^6.0",
-        "illuminate/support": "^5.6|^6.0",
+        "illuminate/validation": "^5.6|^6.0|^7.0",
+        "illuminate/support": "^5.6|^6.0|^7.0",
         "symfony/http-kernel": "^4.0|^5.0"
     },
     "require-dev": {