remove appveyor and travis scripts

Author: jangko

.appveyor.yml

@@ -1,11 +1,9 @@
 # nim-faststreams
 
-[![Build Status (Travis)](https://img.shields.io/travis/status-im/nim-faststreams/master.svg?label=Linux%20/%20macOS "Linux/macOS build status (Travis)")](https://travis-ci.org/status-im/nim-faststreams)
-[![Windows build status (Appveyor)](https://img.shields.io/appveyor/ci/nimbus/nim-faststreams/master.svg?label=Windows "Windows build status (Appveyor)")](https://ci.appveyor.com/project/nimbus/nim-faststreams)
 [![License: Apache](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
 ![Stability: experimental](https://img.shields.io/badge/stability-experimental-orange.svg)
-![Github action](https://github.com/status-im/nim-faststreams/workflows/nim-faststreams%20CI/badge.svg)
+![Github action](https://github.com/status-im/nim-faststreams/workflows/CI/badge.svg)
 
 FastStreams is a highly efficient library for all your I/O needs.