ci: Use ubuntu focal (20.04)

Use Ubuntu Linux 20.04 for testing.
stan-dev · Oct 8, 2020 · c62994a · c62994a
1 parent 49030cf
commit c62994a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@ version: ~> 1.0
 language: python
 python: 3.8
 os: linux
-dist: bionic
+dist: focal
 jobs:
   - python: 3.7
   - python: 3.8