Add support for Laravel 8

Author: JaZo

composer.json

@@ -21,8 +21,8 @@
     ],
     "require": {
         "php": "~7.2",
-        "illuminate/encryption": "^6.0|^7.0",
-        "illuminate/support": "^6.0|^7.0",
+        "illuminate/encryption": "^6.0|^7.0|^8.0",
+        "illuminate/support": "^6.0|^7.0|^8.0",
         "league/flysystem": "^1.0.20"
     },
     "require-dev": {