Update qlty badge for maintainability

Author: lardawge

README.md

@@ -1,8 +1,7 @@
 # CarrierWave Backgrounder
 
 [![Build Status](https://github.com/lardawge/carrierwave_backgrounder/actions/workflows/ruby-ci.yml/badge.svg)](https://github.com/lardawge/carrierwave_backgrounder/actions/workflows/ruby-ci.yml)
-[![Code Climate](https://codeclimate.com/github/lardawge/carrierwave_backgrounder.png)](https://codeclimate.com/github/lardawge/carrierwave_backgrounder)
-
+[![Maintainability](https://qlty.sh/gh/lardawge/projects/carrierwave_backgrounder/maintainability.svg)](https://qlty.sh/gh/lardawge/projects/carrierwave_backgrounder)
 ---
 NOTICE: Version 1.1.0 contains a change in behavior from previous version. When a record is deleted before the job is picked up, it will no longer raise an error. Prior to this change, when using `process_in_background`, if a record was missing, an error was raised. Some users might have relied on that. By default, this will no longer happen. If you want to maintain that behavior, you must set the `suppress_record_not_found_errors` configuration to `false`. This will raise a RecordNotFound error.