travis: use focal distribution for newer glibc required by precompiled comby binary

ChrisTimperley · ChrisTimperley · commit 44a295aaffe2 · 2020-12-06T18:05:28.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,5 @@
 language: python
+dist: focal
 sudo: required
 services:
 - docker
