travis allow repo add

Author: ThetaSinner

.travis.yml

@@ -8,7 +8,7 @@ rust:
 - nightly
 before_install:
   - openssl version -a
-  - sudo add-apt-repository ppa:0k53d-karl-f830m/openssl
+  - sudo add-apt-repository -y ppa:0k53d-karl-f830m/openssl
   - sudo apt-get -qq update
   - sudo apt-get install pkg-config
   - sudo apt-get install openssl