Install graphviz for doxygen job on travis

peterschrammel · peterschrammel · commit 1a36a21c496a · 2018-07-24T16:44:49.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -57,6 +57,7 @@ jobs:
           packages:
             - cmake
             - google-cloud-sdk
+            - graphviz
       cache:
         directories:
           - ${TRAVIS_BUILD_DIR}/doxygen/build/bin
