[requirements] ezpublish-kernel ^6.7

Author: Bertrand Dunogier

composer.json

@@ -10,7 +10,7 @@
     ],
     "require": {
         "php": "~5.6|~7.0",
-        "ezsystems/ezpublish-kernel": "^6.7@rc",
+        "ezsystems/ezpublish-kernel": "^6.7",
         "symfony/symfony": "^2.8 | ^3.0",
         "jms/translation-bundle": "^1.3"
     },