Unify badges style (#2448)

Author: deadnews

README.md

@@ -1,9 +1,9 @@
-[![PyPI](https://img.shields.io/pypi/v/tox?style=flat-square)](https://pypi.org/project/tox/)
+[![PyPI](https://img.shields.io/pypi/v/tox)](https://pypi.org/project/tox/)
 [![Supported Python
 versions](https://img.shields.io/pypi/pyversions/tox.svg)](https://pypi.org/project/tox/)
 [![check](https://github.com/tox-dev/tox/actions/workflows/check.yml/badge.svg)](https://github.com/tox-dev/tox/actions/workflows/check.yml)
 [![Documentation
-status](https://readthedocs.org/projects/tox/badge/?version=latest&style=flat-square)](https://tox.readthedocs.io/en/latest/?badge=latest)
+status](https://readthedocs.org/projects/tox/badge/?version=latest)](https://tox.readthedocs.io/en/latest/?badge=latest)
 [![Code style:
 black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Downloads](https://pepy.tech/badge/tox/month)](https://pepy.tech/project/tox/)