Use explicit OS versions.
@@ -8,12 +8,12 @@ jobs:
Test:
strategy:
matrix:
- os: [ubuntu-latest]
+ os: [ubuntu-18.04]
python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
include:
- - os: macos-latest
+ - os: macos-10.15
python-version: 3.8
- - os: windows-latest
+ - os: windows-2019
python-version: 3.8
runs-on: ${{ matrix.os }}
