Update README.md

Author: wannaphong

README.md

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 Python Thai Automatic Speech Recognition
 
- <a href="https://pypi.python.org/pypi/pythaiasr"><img alt="pypi" src="https://img.shields.io/pypi/v/pythaiasr.svg"/></a><a href="https://opensource.org/licenses/Apache-2.0"><img alt="License" src="https://img.shields.io/badge/License-Apache%202.0-blue.svg"/></a><a href="https://pepy.tech/project/pythaiasr"><img alt="Download" src="https://pepy.tech/badge/pythaiasr/month"/></a>
+ <a href="https://pypi.python.org/pypi/pythaiasr"><img alt="pypi" src="https://img.shields.io/pypi/v/pythaiasr.svg"/></a><a href="https://opensource.org/licenses/Apache-2.0"><img alt="License" src="https://img.shields.io/badge/License-Apache%202.0-blue.svg"/></a><a href="https://pepy.tech/project/pythaiasr"><img alt="Download" src="https://pepy.tech/badge/pythaiasr/month"/></a>[![Coverage Status](https://coveralls.io/repos/github/PyThaiNLP/pythaiasr/badge.svg)](https://coveralls.io/github/PyThaiNLP/pythaiasr)
 
 PyThaiASR is a Python package for Automatic Speech Recognition with focus on Thai language. It have offline thai automatic speech recognition model.