exclude pypy3 from testing
GitHub actions/checkout@v2 suddenly fails for pypy3 with error:
IS_WINDOWS is not defined
@@ -12,7 +12,7 @@ jobs:
runs-on: ubuntu-latest
strategy:
matrix:
- python-version: [3.6, 3.7, 3.8, 3.9, pypy3]
+ python-version: [3.6, 3.7, 3.8, 3.9]
steps:
- uses: actions/checkout@v2
