travis: force homebrew update to fix travis issue

Build fails in Travis CI, because package download fails. Forcing update
of homebrew should fix it.

https://travis-ci.community/t/macos-build-fails-because-of-homebrew-bundle-unknown-command/7296

diff --git a/.travis.yml b/.travis.yml
index 5456c83b3d45eb6506071e5590833ab044f6641c..6f81d6968a791557f0bcbc2f9a36c39c642c0620 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ addons:
             - libuv
             - lmdb
             - meson
+        update: true
 compiler:
     - clang
 notifications: