Update ez platform compatibility

Author: Matthieu Kapetanos

composer.json

@@ -11,7 +11,7 @@
     "license": "GPL-2.0",
     "type": "ezplatform-bundle",
     "require" : {
-        "ezsystems/ezpublish-kernel": "^6.0"
+        "ezsystems/ezpublish-kernel": "^6.0|^7.0"
     },
     "autoload": {
         "psr-4": { "Matthewkp\\EzLoginByEmailBundle\\": "" }