Update README.md

Author: alanbchristie

README.md

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 # Squonk2 Python Command-Line Tools
 
-[![Latest Release](https://gitlab.com/informaticsmatters/squonk2-python-cl-tools/-/badges/release.svg)](https://gitlab.com/informaticsmatters/squonk2-python-cl-tools/-/releases)
+![GitHub tag (latest SemVer)](https://img.shields.io/github/v/tag/informaticsmatters/squonk2-python-cl-tools)
 
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)