[ci] Do not trigger AppVeyor build on .github/ changes (#1089)
[ci] Do not trigger AppVeyor build on .github/ changes (#1089)

The `.github/` directory contains GitHub Actions workflows, which do not
contribute to the AppVeyor builds.

Do not trigger AppVeyor build on .github/ changes.
chwarr/bond,Microsoft/bond,Microsoft/bond,Microsoft/bond,chwarr/bond,chwarr/bond,Microsoft/bond,Microsoft/bond,Microsoft/bond,chwarr/bond,chwarr/bond,chwarr/bond