Mockery fix: added php7 compatible version (@dev)

composer.json

@@ -7,7 +7,7 @@
         "marc-mabe/php-enum": "^2.2"
 	},
     "require-dev": {
-        "mockery/mockery": "^0.9.4",
+        "mockery/mockery": "dev-master#ad31ff997d983e0d5d60ac80cfcedcbb4e6c4461",
 		"kdyby/tester-extras": "dev-master@dev"
     },
     "authors": [