Update readme & add badges

Author: rkoopmans

README.md

@@ -1,4 +1,9 @@
-[<img src="https://travis-ci.org/tinify/tinify-python.svg?branch=master" alt="Build Status">](https://travis-ci.org/tinify/tinify-python)
+[![MIT License](http://img.shields.io/badge/license-MIT-green.svg) ](https://github.com/tinify/tinify-python/blob/main/LICENSE)
+[![CI](https://github.com/tinify/tinify-python/actions/workflows/run-tests.yml/badge.svg)](https://github.com/tinify/tinify-python/actions/workflows/run-tests.yml)
+![PyPI](https://img.shields.io/pypi/v/tinify)
+![PyPI - Python Version](https://img.shields.io/pypi/pyversions/tinify)
+![PyPI - Wheel](https://img.shields.io/pypi/wheel/tinify)
+
 
 # Tinify API client for Python
 
@@ -29,7 +34,7 @@ tinify.from_file('unoptimized.png').to_file('optimized.png')
 
 ```
 pip install -r requirements.txt -r test-requirements.txt
-nosetests
+py.test
 ```
 
 To test more runtimes, tox can be used
@@ -44,7 +49,7 @@ tox
 
 ```
 pip install -r requirements.txt -r test-requirements.txt
-TINIFY_KEY=$YOUR_API_KEY nosetests test/integration.py
+TINIFY_KEY=$YOUR_API_KEY py.test test/integration.py
 ```
 
 ## License