Update README.md

add badge

Author: s00d

README.md

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 Wrapper for automatic reception of SMS-messages by onlinesim.ru
 
 [![N|Solid](https://img.shields.io/pypi/pyversions/onlinesimru.svg)](https://pypi.python.org/pypi/onlinesimru)
+![Python publish](https://github.com/s00d/onlinesim-python-api/workflows/Python%20publish/badge.svg)
 
 ### Installation
 You can install or upgrade package with: