Merge commit '899ee030'

* commit '899ee030':
  Unbreak travis on macos
Merged-by: James Almer <jamrial@gmail.com>

.travis.yml

@@ -19,7 +19,7 @@ cache:
   directories:
     - ffmpeg-samples
 before_install:
-  - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew update --all; fi
+  - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew update; fi
 install:
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install nasm; fi
 script: