Update .travis.yml

Author: pascalbaljet

.travis.yml

@@ -13,7 +13,7 @@ env:
 before_script:
   - sudo apt-get -qq update
   - sudo apt-get install -y software-properties-common
-  - sudo add-apt-repository ppa:mc3man/trusty-media
+  - sudo add-apt-repository -y ppa:mc3man/trusty-media
   - sudo apt-get -qq update
   - sudo apt-get install -y ffmpeg
   - travis_retry composer self-update