on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]

jobs:
  build:
    runs-on: windows-latest
    steps:
    - uses: actions/checkout@v2
    - name: install
      run: python -m pip install tox
    - name: build
      run: python -m tox

Add GitHub Actions instead of AppVeyor
Add GitHub Actions instead of AppVeyor