Update README.md

Author: gaborbernat

README.md

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 # py-filelock
 
+[![PyPI](https://img.shields.io/pypi/v/filelock?style=flat-square)](https://pypi.org/project/filelock/)
+[![Supported Python
+versions](https://img.shields.io/pypi/pyversions/filelock.svg)](https://pypi.org/project/filelock/)
+[![Documentation
+status](https://readthedocs.org/projects/filelock/badge/?version=latest&style=flat-square)](https://filelock.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/filelock/month)](https://pepy.tech/project/filelock/month)
+[![check](https://github.com/tox-dev/py-filelock/actions/workflows/check.yml/badge.svg)](https://github.com/tox-dev/py-filelock/actions/workflows/check.yml)
+
 This package contains a single module, which implements a platform independent
 file lock in Python, which provides a simple way of inter-process communication: