title: Retrofit 2: @Query "encoded=false" don't work
body: <p>0) I am using Retrofit 2 for work with <a href="https://bank.gov.ua/NBUStatService/v1/statdirectory/exchange?date=20170916&amp;json" rel="noreferrer">Bank API</a>.<br>
  1) I have some interface:</p>
  
  <pre><code>public interface ApiService {
      @GET("statdirectory/exchange")
      Call&lt;List&lt;MyModel&gt;&gt;  getСurrency(@Query("date") String inputDate);
  }
  </code></pre>
  
  <p>2) And when i call method <strong>getСurrency(someParametr)</strong>, where someParametr is string, consist with "date&amp;json" (for example, "20170917&amp;json"):</p>
  
  <pre><code>ApiService apiService = RetrofitController.getApi();
  apiService.getCurrency("20170917&amp;json").enqueue(new Callback&lt;List&lt;MyModel&gt;&gt;() {
  
        @Override
        public void onResponse(Call&lt;List&lt;MyModel&gt;&gt; call, Response&lt;List&lt;MyModel&gt;&gt; response) {
            call.request().url();
            Log.e("URL",  call.request().url()+"");
            response.code();
            Log.e("CODE", response.code()+"");      
  }
  //.....
  </code></pre>
  
  <p>3) I see that:<br>
  URL: <em>"<a href="https://bank.gov.ua/NBUStatService/v1/statdirectory/exchange?date=20170917" rel="noreferrer">https://bank.gov.ua/NBUStatService/v1/statdirectory/exchange?date=20170917</a><strong>%26</strong>json"</em> (<strong>&amp;</strong> is replaced by <strong>%26</strong>)<br>
  CODE: <em>"404"</em><br>
  4) Inmy interface i add <strong>encoded</strong>:</p>
  
  <pre><code>getСurrency(@Query(value="date", encoded=false) String inputDate);
  </code></pre>
  
  <p>But <em>my result is the same as in step 3</em>!  </p>
  
  <p>5) How to check this problem? How to get URL without <strong>%26</strong> on my string? I read other questions with similar problem, but isn't solve my problem. Thanks!</p>