remove spaces

Author: tushushu

README.md

@@ -5,7 +5,7 @@
 [![CI](https://github.com/tushushu/ulist/workflows/CI/badge.svg)](https://github.com/tushushu/ulist/actions/workflows/main.yml)
 [![doc](https://github.com/tushushu/ulist/workflows/doc/badge.svg)](https://github.com/tushushu/ulist/actions/workflows/sphinx.yml)
 [![publish](https://github.com/tushushu/ulist/workflows/publish/badge.svg)](https://github.com/tushushu/ulist/actions/workflows/publish.yml)
-[![code style](https://img.shields.io/badge/style-flake8-blue)](https://github.com/PyCQA/flake8)  
+[![code style](https://img.shields.io/badge/style-flake8-blue)](https://github.com/PyCQA/flake8)
 [![Coverage](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/tushushu/3a76a8f4c0d25c24b840fe66a3cf44c1/raw/metacov.json)](https://github.com/tushushu/ulist/actions/workflows/coverage.yml)