.travis.yml: force a brew update for MacOS builds
It looks like the Travis image package databases are out of date
causing the build to error with:
Error: Your Homebrew is outdated. Please run `brew update`.
Error: Kernel.exit
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
diff --git a/.travis.yml b/.travis.yml
index 6628555..5d3d6ee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -43,6 +43,7 @@
- glib
- pixman
- gnu-sed
+ update: true
# The channel name "irc.oftc.net#qemu" is encrypted against qemu/qemu
