docs: remove broken Code Climate GPA badge (#1897)

Author: WuMingDao

README.md

@@ -1,7 +1,6 @@
 # react-i18next [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Awesome%20react-i18next%20for%20react.js%20based%20on%20i18next%20internationalization%20ecosystem%20&url=https://github.com/i18next/react-i18next&via=jamuhl&hashtags=i18n,reactjs,js,dev)
 
 [![CI](https://github.com/i18next/react-i18next/actions/workflows/CI.yml/badge.svg)](https://github.com/i18next/react-i18next/actions/workflows/CI.yml)
-[![Code Climate](https://codeclimate.com/github/codeclimate/codeclimate/badges/gpa.svg)](https://codeclimate.com/github/i18next/react-i18next)
 [![Coverage Status](https://coveralls.io/repos/github/i18next/react-i18next/badge.svg)](https://coveralls.io/github/i18next/react-i18next)
 [![Quality][quality-badge]][quality-url]
 [![npm][npm-dl-badge]][npm-url]