Update OAuth 2.0 package version

Author: vinkla

composer.json

@@ -19,7 +19,7 @@
         "phpdocumentor/reflection-docblock": "2.0.*"
     },
     "require-dev": {
-        "lucadegasperi/oauth2-server-laravel": "4.1.*",
+        "lucadegasperi/oauth2-server-laravel": "5.0.*",
         "tymon/jwt-auth": "0.5.*",
         "laravel/lumen-framework": "5.1.*",
         "illuminate/auth": "5.1.*",