travis: fix Python 3.8 jobs
@@ -57,8 +57,12 @@ jobs:
- env: GROUP=1
python: 3.8-dev
+ dist: xenial
+ sudo: required
- env: GROUP=2
python: 3.8-dev
+ dist: xenial
+ sudo: required
# It's okay to fail on the in-development CPython version.
fast_finish: true
