readme: updated badges

README.md

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+[![Pypi version](https://badgen.net/pypi/v/redmail)](https://pypi.org/project/redmail/)
+[![build](https://github.com/Miksus/red-mail/actions/workflows/main.yml/badge.svg?branch=master)](https://github.com/Miksus/red-mail/actions/workflows/main.yml)
+[![codecov](https://codecov.io/gh/Miksus/red-mail/branch/master/graph/badge.svg?token=IMR1CQT9PY)](https://codecov.io/gh/Miksus/red-mail)
+[![Documentation Status](https://readthedocs.org/projects/red-mail/badge/?version=latest)](https://red-engine.readthedocs.io/en/latest/?badge=latest)
+[![PyPI pyversions](https://badgen.net/pypi/python/redmail)](https://pypi.org/project/redmail/)
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 ## What is it?
 Red Mail is an advanced email sender library. It makes sending emails trivial and 
 has a lot of advanced features such as: