Add badges to README

Author: gahjelle

README.md

@@ -1,5 +1,11 @@
 # `codetiming` - A flexible, customizable timer for your Python code
 
+[![Latest version](https://img.shields.io/pypi/v/codetiming.svg)](https://pypi.org/project/codetiming/)
+[![Python versions](https://img.shields.io/pypi/pyversions/codetiming.svg)](https://pypi.org/project/codetiming/)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
+[![Checked with mypy](http://www.mypy-lang.org/static/mypy_badge.svg)](http://mypy-lang.org/)
+[![CircleCI](https://circleci.com/gh/realpython/codetiming.svg?style=shield)](https://circleci.com/gh/realpython/codetiming)
+
 Install `codetiming` from PyPI:
 
 ```