feat: get the list of markets where spotify is available.

Author: eleonora2687

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -29,4 +29,4 @@ Please describe the tests that you ran to verify your changes. Provide instructi
 - [ ] My changes generate no new warnings
 - [ ] I have added tests that prove my fix is effective or that my feature works
 - [ ] New and existing unit tests pass locally with my changes
-- [ ] Any dependent changes have been merged and published in downstream modules
+- [ ] Any dependent changes have been merged and published in downstream modules

src/main/java/spotify/models/markets/MarketFull.java

@@ -4,8 +4,8 @@
 
 public class MarketFull {
     private List<String> markets;
+
     public List<String> getMarkets() {
         return markets;
-
     }
 }

src/main/java/spotify/retrofit/services/MarketService.java

@@ -1,8 +1,7 @@
 package spotify.retrofit.services;
 
 import retrofit2.Call;
-import retrofit2.http.GET;
-import retrofit2.http.Header;
+import retrofit2.http.*;
 import spotify.models.markets.MarketFull;
 
 public interface MarketService {

src/test/java/spotify/api/impl/MarketApiRetrofitTest.java

@@ -21,7 +21,6 @@
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
-
 public class MarketApiRetrofitTest extends AbstractApiRetrofitTest {
     private MarketApiRetrofit sut;
     @Mock