retrofit logging

```java
        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
        logging.setLevel(HttpLoggingInterceptor.Level.BODY);

        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
        httpClient.addInterceptor(logging);  // <-- this is the important line!

        retrofit = new Retrofit.Builder()
                .baseUrl(getResources().getString(R.string.serverUrl))
                .addConverterFactory(GsonConverterFactory.create(gson))
                .client(httpClient.build())
                .build();
        api = retrofit.create(PROJETOAPI.class);
```