fix CommandNotSupportedException for git outgoing command

scm-plugins/scm-git-plugin/src/main/java/sonia/scm/repository/spi/GitRepositoryServiceProvider.java

@@ -188,6 +188,18 @@ public class GitRepositoryServiceProvider extends RepositoryServiceProvider
     return new GitLogCommand(context, repository);
   }
 
+  /**
+   * Method description
+   *
+   *
+   * @return
+   */
+  @Override
+  public OutgoingCommand getOutgoingCommand()
+  {
+    return new GitOutgoingCommand(handler, context, repository);
+  }
+
   /**
    * Method description
    *