Merge pull request #173 from PolyMathOrg/correct-coverage-badge

Corrected the coverage badge so that it points to the master branch.

Author: Ducasse

README.md

@@ -16,7 +16,7 @@
 [![Pharo version](https://img.shields.io/badge/Pharo-8.0-%23aac9ff.svg)](https://pharo.org/download)
 [![Build Status](https://travis-ci.org/PolyMathOrg/PolyMath.svg?branch=master)](https://travis-ci.org/PolyMathOrg/PolyMath)
 [![Build status](https://ci.appveyor.com/api/projects/status/3tvarh2xi22max8h?svg=true)](https://ci.appveyor.com/project/SergeStinckwich/polymath-88bea)
-[![Coverage Status](https://coveralls.io/repos/github/PolyMathOrg/PolyMath/badge.svg?branch=development)](https://coveralls.io/github/PolyMathOrg/PolyMath?branch=development)
+[![Coverage Status](https://coveralls.io/repos/github/PolyMathOrg/PolyMath/badge.svg?branch=master)](https://coveralls.io/github/PolyMathOrg/PolyMath?branch=master)
 [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/PolyMathOrg/PolyMath/master/LICENSE)
 
 <img width="1675" alt="Screenshot 2019-04-24 at 11 12 57" src="https://user-images.githubusercontent.com/327334/56652094-66eb7780-6682-11e9-9753-101be18df67c.png">