Update README.md

Author: Zigur

README.md

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 [![Py versions](https://img.shields.io/pypi/pyversions/isatools.svg?style=flat&maxAge=3600)](https://pypi.python.org/pypi/isatools/)
 [![Build Status](https://travis-ci.org/ISA-tools/isa-api.svg?branch=master)](https://travis-ci.org/ISA-tools/isa-api/)
 [![Coverage Status](https://coveralls.io/repos/github/ISA-tools/isa-api/badge.svg?branch=master)](https://coveralls.io/github/ISA-tools/isa-api?branch=master)