Update README.md

Author: bording

README.md

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 # LibGit2Sharp
 
-![master CI](https://github.com/libgit2/libgit2sharp/actions/workflows/ci.yml/badge.svg)
+[![CI](https://github.com/libgit2/libgit2sharp/actions/workflows/ci.yml/badge.svg)](https://github.com/libgit2/libgit2sharp/actions/workflows/ci.yml)
 
 **LibGit2Sharp brings all the might and speed of [libgit2](http://libgit2.github.com/), a native Git implementation, to the managed world of .NET**