brew update before building.

c70624e0 · Dilawar Singh · 7f1a95fd · c70624e0
Commit c70624e0 authored 7 years ago by Dilawar Singh
--- a/_travis/prepare_osx.sh
+++ b/_travis/prepare_osx.sh
@@ -19,4 +19,5 @@

 set -o nounset                              # Treat unset variables as an error
 echo "Nothing to do here. The moose.rb formula will install all dependecnies"
+brew update
 brew tap homebrew/science