Travis-CI: Upgrade to Ubuntu Bionic Beaver

mgeier · mgeier · commit cdb7b347e6d7 · 2019-12-20T08:54:26.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: python
-dist: xenial
+dist: bionic
 matrix:
   include:
     - python: "3.5"
