language: python
dist: bionic
python:
 - "3.7"
 - "3.8"
env:
 - HYPOTHESIS_PROFILE=ci
script: make venv test lint mypy

language: python
dist: bionic
python:
 - "3.7"
 - "3.8"
 - "3.9-dev"
env:
 - HYPOTHESIS_PROFILE=ci
script: make venv test lint mypy

Use Python 3.9 in CI
Use Python 3.9 in CI

Currently, only 3.9-dev is available at Travis