package/ci: use Ubuntu 16.04 on Travis.

diff --git a/package/ci/travis.yml b/package/ci/travis.yml
index f54d2b676661ec5bb83e29044f9ecd13c8e63735..141a54bdc5cfb614e66ef994946bccf09355cac7 100644 (file)
--- a/package/ci/travis.yml
+++ b/package/ci/travis.yml
@@ -1,5 +1,7 @@
 # kate: indent-width 2;
 
+dist: xenial
+
 matrix:
   include:
     - language: python