Avoid getting stuck with confirmation

.travis.yml

@@ -5,7 +5,7 @@ compiler:
 script: mkdir build && cd build && cmake .. && make && ./test/unittest
 
 before_install:
-    - sudo add-apt-repository ppa:videolan/master-daily
+    - sudo add-apt-repository -y ppa:videolan/master-daily
     - sudo apt-get update -qq
     - sudo apt-get install -y libvlc-dev libvlccore-dev