[master] 12df4f60a Use bionic where possible

[Federico G. Schwindt]

commit 12df4f60af2ce3cebd26b0075d98908a21109785
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Tue Mar 17 14:24:55 2020 +0000

    Use bionic where possible

diff --git a/.travis.yml b/.travis.yml
index 258ac0c4b..bcce43f23 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,7 @@ jobs:
     - &test-linux
       stage: test
       os: linux
-      dist: xenial
+      dist: bionic
       arch: amd64
       compiler: clang
       addons:
@@ -50,6 +50,7 @@ jobs:
       script: make -j8 witness
     - <<: *test-linux
       stage: sanitizers
+      dist: xenial
       addons:
         apt:
           sources: