use dist:focal = ubuntu 20.04

erossignon · erossignon · commit 589fe2f577cb · 2020-08-15T11:44:24.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: cpp
-# 18.04
-dist: bionic
+# 20.04
+dist: focal
 os:
   - linux
   - osx
