Suggest psr/http-message-implementation

Author: dunglas

composer.json

@@ -24,6 +24,7 @@
         "symfony/phpunit-bridge": "~2.7|~3.0"
     },
     "suggest": {
+        "psr/http-message-implementation": "To use the HttpFoundation factory",
         "zendframework/zend-diactoros": "To use the Zend Diactoros factory"
     },
     "autoload": {