Add missing dependency to travis build.

4ff126cf · Stefan Behnel · 8c3f42bb · 4ff126cf
Commit 4ff126cf authored Aug 10, 2018 by Stefan Behnel
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.travis.yml .travis.yml +1 -0

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--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ addons:
      - gdb
      - python-dbg
      - python3-dbg
+      - libzmq-dev  # needed by IPython/Tornado
      #- gcc-8
      #- g++-8