Update README.md

Author: benkiel

README.md

@@ -1,7 +1,7 @@
 [![Build Status](https://github.com/robotools/fontMath/workflows/Tests/badge.svg)](https://github.com/robotools/fontMath/actions?query=workflow%3ATests)
 [![codecov](https://codecov.io/gh/robotools/fontMath/branch/master/graph/badge.svg)](https://codecov.io/gh/robotools/fontMath)
 [![PyPI version fury.io](https://badge.fury.io/py/fontMath.svg)](https://pypi.org/project/fontMath/)
-[![Python versions](https://img.shields.io/badge/python-3.6%2C%203.7%2C%203.8%2C%203.9-blue.svg)]
+![Python versions](https://img.shields.io/badge/python-3.6%2C%203.7%2C%203.8%2C%203.9-blue.svg)
 
 # fontMath
 A collection of objects that implement fast font, glyph, etc. math.