Update brew packages for darwin.

ioquatix · ioquatix · commit a2d2f10b965f · 2019-06-11T11:05:53.000+12:00
diff --git a/.travis.yml b/.travis.yml
@@ -22,10 +22,11 @@ addons:
       - libpoppler-glib-dev
       - librsvg2-dev
       - libwebp-dev
-  brew:
+  homebrew:
     packages:
       # A simple way to install all dependencies.
       - vips
+      - glib
 
 cache:
   bundler: true
