README.md: add black badge

csernazs · csernazs · commit 99cfbe1723d3 · 2022-07-13T18:08:31.000+01:00
diff --git a/README.md b/README.md
@@ -3,6 +3,7 @@
  [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
 [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=K6PU3AGBZW4QC&item_name=pytest-httpserver&currency_code=EUR&source=url)
 [![codecov](https://codecov.io/gh/csernazs/pytest-httpserver/branch/master/graph/badge.svg?token=MX2JXbHqRH)](https://codecov.io/gh/csernazs/pytest-httpserver)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 ## pytest_httpserver
 
