travis: Use Ubuntu (Bionic Beaver) 18.04 LTS

BKPepe · BKPepe · commit f2c7a00ef4ab · 2019-10-23T15:30:35.000+02:00
Signed-off-by: Josef Schlehofer &lt;pepe.schlehofer@gmail.com&gt;
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ git:
   quiet: true
 
 language: c
-dist: trusty
+dist: bionic
 sudo: false
 cache:
   directories:
