chore: update readme badges

README.md

@@ -2,9 +2,9 @@
 
 Accelerated Excel XLSX writing library for Python
 
-master: [![build-status-master](https://travis-ci.org/kz26/PyExcelerate.svg?branch=master)](https://travis-ci.org/kz26/PyExcelerate)
-dev: [![build-status-dev](https://travis-ci.org/kz26/PyExcelerate.svg?branch=dev)](https://travis-ci.org/kz26/PyExcelerate)
-test coverage: [![coverage-status](https://coveralls.io/repos/kz26/PyExcelerate/badge.svg)](https://coveralls.io/r/kz26/PyExcelerate)
+[![coverage-status](https://coveralls.io/repos/kz26/PyExcelerate/badge.svg)](https://coveralls.io/r/kz26/PyExcelerate) 
+![PyPI - Python Version](https://img.shields.io/pypi/pyversions/pyexcelerate)
+![PyPI - Version](https://img.shields.io/pypi/v/pyexcelerate)
 
 * Authors: [Kevin Wang](https://github.com/kevmo314) and [Kevin Zhang](https://github.com/kz26)
 * Copyright 2015 Kevin Wang, Kevin Zhang. Portions copyright Google, Inc.