Remove Appveyor and travisCI badges

Author: SergeStinckwich

README.md

@@ -13,8 +13,6 @@
 </p>
 
 [![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=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)