Fix to JSON syntax

Author: Jamie Hannaford

composer.json

@@ -30,7 +30,7 @@
         "guzzle/http" : "~3.8",
         "psr/log": "~1.0",
         "mikemccabe/json-patch-php": "~0.1"
-    ,
+    },
     "require-dev" : {
         "phpunit/phpunit": "4.3.*",
         "satooshi/php-coveralls": "0.6.*@dev",