Update composer.json

Author: coreation

composer.json

@@ -14,7 +14,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "~5.5",
-        "enqueue/enqueue": "^0.10",
+        "enqueue/enqueue-dev": "dev-master",
         "enqueue/null": "^0.10@dev",
         "enqueue/test": "^0.10@dev",
         "enqueue/simple-client": "^0.10@dev"