Bump Ubuntu version at Travis so we can get 3.8

Xenial (16.04) is the current default at Travis, and it does have 3.8 available: https://docs.travis-ci.com/user/languages/python/#python-versions
tahoe-lafs · Jul 3, 2020 · 069f62b · 069f62b
1 parent 8f153f1
commit 069f62b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 sudo: false
 language: python
 cache: pip
-dist: trusty
+dist: xenial
 before_cache:
   - rm -f $HOME/.cache/pip/log/debug.log
 git: