fix CI badge URL (badges/shields#8671)

Author: Technologicat

README.md

@@ -2,7 +2,7 @@
 
 In the spirit of [toolz](https://github.com/pytoolz/toolz), we provide missing features for Python, mainly from the list processing tradition, but with some Haskellisms mixed in. We extend the language with a set of [syntactic macros](https://en.wikipedia.org/wiki/Macro_(computer_science)#Syntactic_macros). We also provide an in-process, background [REPL](https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop) server for live inspection and hot-patching. The emphasis is on **clear, pythonic syntax**, **making features work together**, and **obsessive correctness**.
 
-![100% Python](https://img.shields.io/github/languages/top/Technologicat/unpythonic) ![supported language versions](https://img.shields.io/pypi/pyversions/unpythonic) ![supported implementations](https://img.shields.io/pypi/implementation/unpythonic) ![CI status](https://img.shields.io/github/workflow/status/Technologicat/unpythonic/Python%20package) [![codecov](https://codecov.io/gh/Technologicat/unpythonic/branch/master/graph/badge.svg)](https://codecov.io/gh/Technologicat/unpythonic)  
+![100% Python](https://img.shields.io/github/languages/top/Technologicat/unpythonic) ![supported language versions](https://img.shields.io/pypi/pyversions/unpythonic) ![supported implementations](https://img.shields.io/pypi/implementation/unpythonic) ![CI status](https://img.shields.io/github/actions/workflow/status/Technologicat/unpythonic/python-package.yml?branch=master) [![codecov](https://codecov.io/gh/Technologicat/unpythonic/branch/master/graph/badge.svg)](https://codecov.io/gh/Technologicat/unpythonic)  
 ![version on PyPI](https://img.shields.io/pypi/v/unpythonic) ![PyPI package format](https://img.shields.io/pypi/format/unpythonic) ![dependency status](https://img.shields.io/librariesio/github/Technologicat/unpythonic)  
 ![license: BSD](https://img.shields.io/pypi/l/unpythonic) ![open issues](https://img.shields.io/github/issues/Technologicat/unpythonic) [![PRs welcome](https://img.shields.io/badge/PRs-welcome-brightgreen)](http://makeapullrequest.com/)