Update homebrew before installing packages.

jdm · web-flow · commit 980d9943fe80 · 2019-06-24T12:02:33.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -21,6 +21,7 @@ addons:
       - g++-6
       - clang-5.0
   homebrew:
+    update: true
     packages:
       - python
       - python@2
