title: Retrofit 2 addQueryParam replacement
body: <p>In previous retrofit versions it was possible to add an interceptor and use that to add query parameters that were globally needed for example:</p>
  
  <pre><code> .setRequestInterceptor(new RequestInterceptor() {
                      @Override
                      public void intercept(RequestFacade requestFacade) {
                          requestFacade.addQueryParam("platform", "android");
                          requestFacade.addQueryParam("app_version", com.package.BuildConfig.VERSION_NAME);
  
  
                  }
              })
  </code></pre>
  
  <p>With the new implementation, it's required that you use OkHttpClient.interceptors.  With this new approach, how would one append parameters without removing the original paramaters? </p>