TASK: Declare Neos 8 compatibility

Author: mficzel

composer.json

@@ -4,7 +4,7 @@
     "description": "Neos plugin demonstrating a simple frontend login",
     "license": "MIT",
     "require": {
-        "neos/neos": "^5.0 || ^7.0 || dev-master"
+        "neos/neos": "^5.0 || ^7.0 || ^8.0 || dev-master"
     },
     "autoload": {
         "psr-4": {