Fix status badges

Author: tomwhite

README.md

@@ -1,10 +1,9 @@
 # sgkit: Scalable genetics toolkit in Python
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-[![asv](https://img.shields.io/badge/Benchmarked%20by-asv-green.svg?style=flat)](https://sgkit-dev.github.io/sgkit-benchmarks-asv/)
+[![Build](https://github.com/sgkit-dev/sgkit/actions/workflows/build.yml/badge.svg)](https://github.com/sgkit-dev/sgkit/actions/workflows/build.yml)
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+[![Docs](https://github.com/sgkit-dev/sgkit/actions/workflows/docs.yml/badge.svg)](https://sgkit-dev.github.io/sgkit/)
+[![Upstream](https://github.com/sgkit-dev/sgkit/actions/workflows/upstream.yml/badge.svg)](https://github.com/sgkit-dev/sgkit/actions/workflows/upstream.yml)
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 Sgkit is a Python package that provides a variety of analytical genetics methods through the use of