chore: clean up README

[skip ci]

Author: unknwon

README.md

@@ -1,9 +1,7 @@
 # Git Module 
 
 [![GitHub Workflow Status](https://img.shields.io/github/workflow/status/gogs/git-module/Go?logo=github&style=for-the-badge)](https://github.com/gogs/git-module/actions?query=workflow%3AGo)
-[![codecov](https://img.shields.io/codecov/c/github/gogs/git-module/master?logo=codecov&style=for-the-badge)](https://codecov.io/gh/gogs/git-module)
 [![GoDoc](https://img.shields.io/badge/GoDoc-Reference-blue?style=for-the-badge&logo=go)](https://pkg.go.dev/github.com/gogs/git-module?tab=doc)
-[![Sourcegraph](https://img.shields.io/badge/view%20on-Sourcegraph-brightgreen.svg?style=for-the-badge&logo=sourcegraph)](https://sourcegraph.com/github.com/gogs/git-module)
 
 Package git-module is a Go module for Git access through shell commands.