title: OkHttpClient "open" method missing in v2.0
body: <p>If you are upgrading from OkHttp library from 1.x to 2.x, glaringly the OkHttpClient method "open" is missing. The below code will NOT compile.</p>
  
  <pre><code>        OkHttpClient client = new OkHttpClient();
          HttpURLConnection conn = client.open(url);
  </code></pre>