update travis image settings

298a938d · Dr.李 · 7e90f69e · 298a938d
Commit 298a938d authored Dec 18, 2017 by Dr.李
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.travis.yml .travis.yml +1 -0

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--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,7 @@ python:
 # command to install dependencies
 sudo: enabled
 dist: trusty
+group: travis_lts
 install:
  # We do this conditionally because it saves us some downloading if the
  # version is the same.