Drop Appveyor badge and add GitHub Actions status badge (#61)

* Drop AppVeyor badge

Signed-off-by: Sven Strickroth <[email protected]>

* Add GitHub Actions status badge

Signed-off-by: Sven Strickroth <[email protected]>

---------

Signed-off-by: Sven Strickroth <[email protected]>

Author: csware

README.md

@@ -3,7 +3,7 @@
 This is an [EditorConfig][] plugin for [Notepad++](https://notepad-plus-plus.org/).
 
 ## Buildstatus
-[![Appveyor build status](https://ci.appveyor.com/api/projects/status/github/xuhdev/editorconfig-notepad-plus-plus?branch=master&svg=true)](https://ci.appveyor.com/project/xuhdev/editorconfig-notepad-plus-plus)
+[![CI_build](https://github.com/editorconfig/editorconfig-notepad-plus-plus/actions/workflows/CI_build.yml/badge.svg)](https://github.com/editorconfig/editorconfig-notepad-plus-plus/actions/workflows/CI_build.yml)
 [![GitHub release](https://img.shields.io/github/tag/editorconfig/editorconfig-notepad-plus-plus.svg)](https://github.com/editorconfig/editorconfig-notepad-plus-plus/tags)
 
 ## Installation