test(travis): bump linux version

duncdrum · duncdrum · commit 0e5836ca263b · 2020-10-02T13:53:02.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: java
 
-dist: xenial
+dist: bionic
 addons:
   apt:
     packages:
