Fix: Correct CI badge URL in README.md

The CI badge in the README was pointing to a non-existent workflow name,
causing it to always show a failing status. This commit updates the URL
to point to the correct 'Build and test py-lmdb' workflow.

Author: jnwatson

README.md

@@ -3,7 +3,7 @@ This is a universal Python binding for the LMDB ‘Lightning’ Database.
 See [the documentation](https://lmdb.readthedocs.io) for more information.
 
 ### CI State
-[![master](https://github.com/jnwatson/py-lmdb/workflows/Build,%20run,%20and%20test%20py-lmdb/badge.svg)](https://github.com/jnwatson/py-lmdb/actions/workflows/python-package.yml)
+[![master](https://github.com/jnwatson/py-lmdb/workflows/Build%20and%20test%20py-lmdb/badge.svg)](https://github.com/jnwatson/py-lmdb/actions/workflows/python-package.yml)
 
 # Python Version Support Statement