fix CI badge

Author: KristofferC

README.md

@@ -10,8 +10,8 @@
 [docs-v1-img]: https://img.shields.io/badge/docs-v1-blue.svg
 [docs-v1-url]: https://sparsearrays.juliasparse.org/v1/
 
-[ci-img]: https://github.com/JuliaLang/sparsearrays.jl/workflows/Run%20tests/badge.svg?branch=master
-[ci-url]: https://github.com/JuliaLang/sparsearrays.jl/actions?query=workflow%3A%22Run+tests%22
+[ci-img]: https://github.com/JuliaLang/sparsearrays.jl/workflows/CI/badge.svg?branch=main
+[ci-url]: https://github.com/JuliaLang/sparsearrays.jl/actions?query=workflow%3A%22CI%22
 
 [codecov-img]: https://codecov.io/gh/JuliaLang/sparsearrays.jl/branch/master/graph/badge.svg
 [codecov-url]: https://codecov.io/gh/JuliaLang/sparsearrays.jl