Declare compatibility with Neos 7.x

Author: robertlemke

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "neos/neos": "^5.0",
+        "neos/neos": "^5.0 || ^7.0",
         "robertlemke/akismet": "^3.0",
         "robertlemke/rss": "^2.0",
         "flownative/gravatar": "^2.0"