Update to Ubuntu 20.04 for travis build

iluuu1994 · iluuu1994 · commit b1ccbc8210ed · 2023-02-28T21:56:56.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 git:
   quiet: true
 
-dist: bionic
+dist: focal
 language: c
 os: linux
 addons:
