Update README.md

README.md

-# QPixel [![CircleCI Build Status](https://circleci.com/gh/codidact/qpixel.svg?style=svg)](https://circleci.com/gh/codidact/qpixel) [![Test coverage](https://coveralls.io/repos/github/ArtOfCode-/qpixel/badge.svg?branch=master)](https://coveralls.io/github/ArtOfCode-/qpixel?branch=master) [![DOI](https://zenodo.org/badge/237078806.svg)](https://zenodo.org/badge/latestdoi/237078806)
+# QPixel [![CircleCI Build Status](https://circleci.com/gh/codidact/qpixel.svg?style=svg)](https://circleci.com/gh/codidact/qpixel) [![Coverage Status](https://coveralls.io/repos/github/codidact/qpixel/badge.svg)](https://coveralls.io/github/codidact/qpixel) [![DOI](https://zenodo.org/badge/237078806.svg)](https://zenodo.org/badge/latestdoi/237078806)
 Rails-based version of our core software. Currently under active development towards MVP.
 
 ## Installation