Add missing comma

Author: bancer

composer.json

@@ -42,7 +42,7 @@
         "cakephp/orm": "^3.6"
     },
     "require-dev": {
-        "cakephp/cakephp": "^3.6"
+        "cakephp/cakephp": "^3.6",
         "cakephp/cakephp-codesniffer": "^3.0",
         "phpunit/phpunit": "^5.7.14|^6.0"
     },