Travis: Cache Homebrew downloads

... to speed up the Mac CI builds.

diff --git a/.travis.yml b/.travis.yml
index 04eff2c0895e55d3f8bf68a3fd0abf6bc265d6ae..4bbe022100a4c87984893cd4e70b04c45506c674 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -57,6 +57,13 @@ addons:
     brewfile: true
     update: true
 
+cache:
+  directories:
+    - $HOME/Library/Caches/Homebrew
+
+before_cache:
+  - if [ "${TRAVIS_OS_NAME}" = "osx" ]; then brew cleanup; fi
+
 before_install:
   - if [ "$TRAVIS_OS_NAME" = "osx" ]; then
       git clone --depth=1 https://github.com/libjpeg-turbo/gas-preprocessor.git ~/src/gas-preprocessor &&