Update RequestMethods.php

Small bugfix ;)
Make the response object protected

If extending the ApiContext, which is cool if you want to implement more custom tests on the response object, the response should be protected so it can be accessed from sub-classes.
Merge pull request #82 from Max101/patch-2

Make the response object protected in ApiContext
Merge pull request #81 from Max101/patch-1

Update RequestMethods.php
Merge pull request #1 from KnpLabs/master

Sync