[gnome-commander] Move to Ubuntu-20.04 in travis.yml, only build master and gcmd-1-12

[Uwe Scholz <uwescholz src gnome org>]

commit 5e235720482ffd754a936ae552424b480b1b1637
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Mon Mar 15 22:08:44 2021 +0100

    Move to Ubuntu-20.04 in travis.yml, only build master and gcmd-1-12

 .travis.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index a0dc4d9b..4fd56c99 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 sudo:     required
-dist:     bionic
+dist:     focal
 language: cpp
 
 services:
@@ -11,7 +11,7 @@ script:
 branches:
   only:
     - master
-    - gcmd-1-10
+    - gcmd-1-12
 
 notifications:
   recipients: