Update brew

CodaFi · CodaFi · commit 9cb238968ae3 · 2017-02-18T23:22:31.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -8,6 +8,7 @@ matrix:
     osx_image: xcode8
     before_install:
     - export PATH=/usr/local/opt/llvm/bin:"${PATH}"
+    - brew update
     - brew install llvm
     - sudo swift utils/make-pkgconfig.swift
     script:
