Remove trailing comma

Author: bcrowe

composer.json

@@ -19,7 +19,7 @@
         "cakephp/cakephp": "^3.4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.0",
+        "phpunit/phpunit": "^5.0"
     },
     "autoload": {
         "psr-4": {