Merge pull request KnpLabs#403 from Nyholm/redirect

Make sure we are following redirects

Author: cursedcoder

lib/Github/Client.php

@@ -146,6 +146,7 @@ public function __construct(HttpClient $httpClient = null)
         $this->responseHistory = new History();
         $this->addPlugin(new GithubExceptionThrower());
         $this->addPlugin(new Plugin\HistoryPlugin($this->responseHistory));
+        $this->addPlugin(new Plugin\RedirectPlugin());
         $this->addPlugin(new Plugin\AddHostPlugin(UriFactoryDiscovery::find()->createUri('https://api.github.com/')));
         $this->addPlugin(new Plugin\HeaderDefaultsPlugin(array(
             'User-Agent'  => 'php-github-api (http://github.com/KnpLabs/php-github-api)',