Remove broken Travis badge from readme

Follows-up #449.

Author: Krinkle

README.md

@@ -8,8 +8,8 @@ APCu only supports userland caching of variables.
 APCu is APC stripped of opcode caching.
 See [APCu Backwards Compatibility Module](https://github.com/krakjoe/apcu-bc) which provides a drop in replacement for APC.
 
-[![Build Status](https://travis-ci.org/krakjoe/apcu.svg?branch=master)](https://travis-ci.org/krakjoe/apcu)
-[![Build status](https://ci.appveyor.com/api/projects/status/om63glh4g24gi1p9/branch/master?svg=true)](https://ci.appveyor.com/project/krakjoe/apcu/branch/master)
+[![Build status: GitHub](https://github.com/krakjoe/apcu/actions/workflows/config.yml/badge.svg)](https://github.com/krakjoe/apcu/actions/workflows/config.yml)
+[![Build status: AppVeyor](https://ci.appveyor.com/api/projects/status/om63glh4g24gi1p9/branch/master?svg=true)](https://ci.appveyor.com/project/krakjoe/apcu/branch/master)
 
 Documentation
 ============