docs(readme): replace badgen.net with shields.io status badges

Author: remarkablemark

README.md

@@ -1,6 +1,6 @@
 # python_package_template
 
-[![PyPI version](https://badgen.net/pypi/v/python_package_template)](https://pypi.org/project/python_package_template/)
+[![PyPI version](https://img.shields.io/pypi/v/python_package_template)](https://pypi.org/project/python_package_template/)
 [![codecov](https://codecov.io/gh/remarkablemark/python_package_template/graph/badge.svg?token=A5tAkYLEAw)](https://codecov.io/gh/remarkablemark/python_package_template)
 [![lint](https://github.com/remarkablemark/python_package_template/actions/workflows/lint.yml/badge.svg)](https://github.com/remarkablemark/python_package_template/actions/workflows/lint.yml)