Updated retrofit setup to return RxJava2 observables.

Author: marcinkunert

app/src/main/java/com/morihacky/android/rxjava/retrofit/GithubApi.java

@@ -2,9 +2,9 @@
 
 import java.util.List;
 
+import io.reactivex.Observable;
 import retrofit2.http.GET;
 import retrofit2.http.Path;
-import rx.Observable;
 
 public interface GithubApi {
 

app/src/main/java/com/morihacky/android/rxjava/retrofit/GithubService.java

@@ -2,11 +2,11 @@
 
 import android.text.TextUtils;
 
+import com.jakewharton.retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
+
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
-import okhttp3.Response;
 import retrofit2.Retrofit;
-import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
 import retrofit2.converter.gson.GsonConverterFactory;
 
 import static java.lang.String.format;
@@ -17,7 +17,7 @@ private GithubService() {
     }
 
     public static GithubApi createGithubService(final String githubToken) {
-        Retrofit.Builder builder = new Retrofit.Builder().addCallAdapterFactory(RxJavaCallAdapterFactory.create())
+        Retrofit.Builder builder = new Retrofit.Builder().addCallAdapterFactory(RxJava2CallAdapterFactory.create())
               .addConverterFactory(GsonConverterFactory.create())
               .baseUrl("https://api.github.com");