Requiring zendframework/zend-diactoros to get rid of the internal stubs for the PSR7 messages

Author: Ocramius

composer.json

@@ -31,7 +31,8 @@
         "ext-curl": "*",
         "ext-json": "*",
         "psr/log": "~1.0",
-        "psr/http-message": "~1.0"
+        "psr/http-message": "~1.0",
+        "zendframework/zend-diactoros": "^1.3"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.5.0",