TASK: Declare compatibility to Flow 7.0

Author: daniellienert

composer.json

@@ -8,7 +8,7 @@
         "doctrine/annotations": "^1.0",
         "doctrine/collections": "^1.0",
         "doctrine/orm": "^2.0",
-        "neos/error-messages": "^6.0",
+        "neos/error-messages": "^6.0 || ^7.0",
         "neos/flow": "^6.0 || ^7.0",
         "neos/utility-arrays": "^6.0 || ^7.0",
         "neos/utility-objecthandling": "^6.0 || ^7.0"