ci: silent a bit `brew update`

It's quite verbose (and long...)

diff --git a/tests/ci/install.sh b/tests/ci/install.sh
index a8ed1679f6cd0af474d5eb9ed130d2dd98f19139..580fcfd2f4d73a7697d44932ce326ae0c075d11b 100755 (executable)
--- a/tests/ci/install.sh
+++ b/tests/ci/install.sh
@@ -4,7 +4,7 @@ set -e
 
 case "$(uname -s)" in
     Darwin)
-        brew update
+        brew update > /dev/null
         brew bundle --file=- <<-EOS
 brew "libtool"
 brew "libxml2"