Update .travis.yml

ce4ca079 · cclauss · GitHub · 91188c6b · ce4ca079
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.travis.yml .travis.yml +1 -0

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--- a/.travis.yml
+++ b/.travis.yml
@@ -19,6 +19,7 @@ matrix:
            - python2.7-dev
        ssh_known_hosts: 13.229.163.131
    - python: 3.7
+      dist: xenial  # required for Python >= 3.7 (travis-ci/travis-ci#9069)
      addons:
        apt:
          packages: