fix CI badge URL (badges/shields#8671)

README.md

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 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**.
 
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 ![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/)