move auto_merge to PullRequestItem

Author: sindunuragarp

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

@@ -79,7 +79,4 @@ public interface PullRequest extends PullRequestItem {
   /** The mergeable state of this PR. */
   @Nullable
   String mergeableState();
-
-  @Nullable
-  AutoMerge autoMerge();
 }

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

@@ -134,6 +134,10 @@ public interface PullRequestItem extends PartialPullRequestItem {
   @Nullable
   String nodeId();
 
+  /** Is Automerge Enabled */
+  @Nullable
+  AutoMerge autoMerge();
+
   /** Is it a draft PR? */
   Optional<Boolean> draft();