feat: add labels to PullRequestItem

Author: sindunuragarp

src/main/java/com/spotify/github/v3/prs/PullRequestItem.java

@@ -7,9 +7,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -32,6 +32,8 @@
 import java.util.List;
 import java.util.Optional;
 import javax.annotation.Nullable;
+
+import com.spotify.github.v3.issues.Label;
 import org.immutables.value.Value;
 
 /** Pull request item resource represents data returned during pull request list operation */
@@ -112,6 +114,10 @@ public interface PullRequestItem extends CloseTracking {
   @Nullable
   User user();
 
+  /** A list of PR labels */
+  @Nullable
+  List<Label> labels();
+
   /** Statuses API URL. */
   @Nullable
   URI statusesUrl();