title: retrofit 2 @headers error in kotlin
body: <p>I try to add multiple static headers with retrofit 2 (2.3.0) like this :</p>
  
  <pre><code>interface WeatherAPI {
  
      @Headers({
          "Accept: application/json",
          "Content-type:application/json"
      })
      @GET("/data/2.5/weather")
      fun getWeatherForCityName(@Query("q") city: String, @Query("appid") appid: String) : Call&lt;GetWeatherResponse&gt;;
  
  }
  </code></pre>
  
  <p>I have the folowing error :</p>
  
  <p><img src="https://i.stack.imgur.com/T5Sfx.png" alt="error"></p>
  
  <p>Any idea of my mistake?</p>