Remove conformance workflow link from README

This was removed as a separate workflow in
1f0d183; now we just have CI.

Author: stefanvanburen

README.md

@@ -3,7 +3,6 @@
 # protovalidate-python
 
 [![CI](https://github.com/bufbuild/protovalidate-python/actions/workflows/ci.yaml/badge.svg)](https://github.com/bufbuild/protovalidate-python/actions/workflows/ci.yaml)
-[![Conformance](https://github.com/bufbuild/protovalidate-python/actions/workflows/conformance.yaml/badge.svg)](https://github.com/bufbuild/protovalidate-python/actions/workflows/conformance.yaml)
 [![PyPI version](https://img.shields.io/pypi/v/protovalidate)](https://pypi.org/project/protovalidate)
 
 [Protovalidate][protovalidate] is the semantic validation library for Protobuf. It provides standard annotations to validate common rules on messages and fields, as well as the ability to use [CEL][cel] to write custom rules. It's the next generation of [protoc-gen-validate][protoc-gen-validate].