AutomergeChangeAction: Prefer to return Response<?> instead of Response<Object>

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I373b92321b5ea292012672d0826826fda05c623e
diff --git a/src/main/java/com/googlesource/gerrit/plugins/automerger/AutomergeChangeAction.java b/src/main/java/com/googlesource/gerrit/plugins/automerger/AutomergeChangeAction.java
index 9caa9e2..79498df 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/automerger/AutomergeChangeAction.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/automerger/AutomergeChangeAction.java
@@ -62,7 +62,7 @@
    * @throws StorageException
    */
   @Override
-  public Response<Object> apply(RevisionResource rev, Input input)
+  public Response<?> apply(RevisionResource rev, Input input)
       throws IOException, RestApiException, StorageException, ConfigInvalidException {
     Map<String, Boolean> branchMap = input.branchMap;