refactored some stuff based on MR feedback

app/services/git_push_service.rb

@@ -136,6 +136,6 @@ class GitPushService < BaseService
   end
 
   def branch_name
-    @_branch_name ||= Gitlab::Git.ref_name(params[:ref])
+    @branch_name ||= Gitlab::Git.ref_name(params[:ref])
   end
 end

app/workers/post_receive.rb

@@ -38,12 +38,7 @@ class PostReceive
       if Gitlab::Git.tag_ref?(ref)
         GitTagPushService.new.execute(project, @user, oldrev, newrev, ref)
       else
-        GitPushService.new(project, @user,
-                           {
-                               oldrev: oldrev,
-                               newrev: newrev,
-                               ref: ref
-                           }).execute
+        GitPushService.new(project, @user, oldrev: oldrev, newrev: newrev, ref: ref).execute
       end
     end
   end