Remove Appveyor status from README.md (#6347)

Author: SiarheiFedartsou

README.md

@@ -1,8 +1,8 @@
 ## Open Source Routing Machine
 
-| Linux / macOS | Windows | Code Coverage |
-| ------------- | ------- | ------------- |
-| [![osrm-backend CI](https://github.com/Project-OSRM/osrm-backend/actions/workflows/osrm-backend.yml/badge.svg)](https://github.com/Project-OSRM/osrm-backend/actions/workflows/osrm-backend.yml) | [![AppVeyor](https://ci.appveyor.com/api/projects/status/4iuo3s9gxprmcjjh)](https://ci.appveyor.com/project/DennisOSRM/osrm-backend) | [![Codecov](https://codecov.io/gh/Project-OSRM/osrm-backend/branch/master/graph/badge.svg)](https://codecov.io/gh/Project-OSRM/osrm-backend) |
+| Linux / macOS / Windows | Code Coverage |
+| ----------------------- | ------------- |
+| [![osrm-backend CI](https://github.com/Project-OSRM/osrm-backend/actions/workflows/osrm-backend.yml/badge.svg)](https://github.com/Project-OSRM/osrm-backend/actions/workflows/osrm-backend.yml) | [![Codecov](https://codecov.io/gh/Project-OSRM/osrm-backend/branch/master/graph/badge.svg)](https://codecov.io/gh/Project-OSRM/osrm-backend) |
 
 High performance routing engine written in C++14 designed to run on OpenStreetMap data.