Merge lp:~jelmer/brz/travis-xenial into lp:brz

[Jelmer Vernooij]

Fix python 3.7 tests on Travis.

Fix python 3.7 tests on Travis.

[Martin Packman (gz)]

Is sudo needed for the 3.7 install? Might be worth testing 3.7 on a post-xenial system anyway? Shouldn't matter much I hope.

review: Approve

[Jelmer Vernooij (jelmer)]

It appears to still be necessary:
https://github.com/travis-ci/travis-ci/issues/9069#issuecomment-425720905

=== modified file '.travis.yml'
--- .travis.yml	2019-01-02 20:32:13 +0000
+++ .travis.yml	2019-01-27 17:18:01 +0000
@@ -2,18 +2,19 @@
 addons:
   apt:
     update: true
-sudo: false
+sudo: true
 cache: pip
 
 python:
   - 3.5
   - 3.6
-  - 3.7
 
 matrix:
   include:
     - python: 2.7
       env: SELFTEST_OPTIONS="--coverage"
+    - python: 3.7
+      dist: xenial
 
 script:
   - make docs extensions