[ci] Enable test workflows on Python 3.9.
Issue
@@ -18,7 +18,7 @@ jobs:
fail-fast: false
matrix:
os: [ubuntu-latest, macos-latest]
- python: [3.6, 3.7, 3.8]
+ python: [3.6, 3.7, 3.8, 3.9]
exclude:
# Only test recent python versions on macOS.
- os: macos-latest
