Fix badge URL

The badge always shows the build as failing, even if it is actually successful.

This issue has been reported on actions/starter-workflows#1525 , and the fix suggested on actions/starter-workflows#1525 (comment) works.

README.md

@@ -1,6 +1,7 @@
 # Better Protobuf / gRPC Support for Python
 
-![](https://github.com/danielgtaylor/python-betterproto/workflows/CI/badge.svg)
+![](https://github.com/danielgtaylor/python-betterproto/actions/workflows/ci.yml/badge.svg)
+
 > :octocat: If you're reading this on github, please be aware that it might mention unreleased features! See the latest released README on [pypi](https://pypi.org/project/betterproto/).
 
 This project aims to provide an improved experience when using Protobuf / gRPC in a modern Python environment by making use of modern language features and generating readable, understandable, idiomatic Python code. It will not support legacy features or environments (e.g. Protobuf 2). The following are supported: