Try to fix TravisCI

Using xenial helped for the DateTime package.
zopefoundation · Jun 28, 2019 · 771f482 · 771f482
1 parent aa6b505
commit 771f482
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: python
-
+dist: xenial
 python:
     - 2.7
     - 3.5