[ci] Adding appveyor support for windows testing
[ci] Adding appveyor support for windows testing

SergeL/pre-commit,JiriChara/pre-commit,boneskull/pre-commit,observing/pre-commit,cvan/pre-commit,observing/pre-commit,pzarudnii/pre-commit,boneskull/pre-commit,SergeL/pre-commit,pzarudnii/pre-commit,cvan/pre-commit,JiriChara/pre-commit