remove broken badges from readme (#1238)

Author: Nyholm

README.md

@@ -1,8 +1,6 @@
 OverblogGraphQLBundle
 ======================
 
-![CI](https://github.com/overblog/GraphQLBundle/workflows/CI/badge.svg?branch=master)
-[![Build status](https://ci.appveyor.com/api/projects/status/7ksxlcgwt40q74hv/branch/master?svg=true)](https://ci.appveyor.com/project/overblog/graphqlbundle/branch/master)
 [![Coverage Status](https://coveralls.io/repos/github/overblog/GraphQLBundle/badge.svg?branch=master)](https://coveralls.io/github/overblog/GraphQLBundle?branch=master)
 [![Latest Stable Version](https://poser.pugx.org/overblog/graphql-bundle/version)](https://packagist.org/packages/overblog/graphql-bundle)
 [![Latest Unstable Version](https://poser.pugx.org/overblog/graphql-bundle/v/unstable)](https://packagist.org/packages/overblog/graphql-bundle)