Update .travis.yml

Author: esrrhs

.travis.yml

@@ -18,7 +18,7 @@ env:
     - secure: "HrsaCb+N66EG1HR+LWH1u51SjaJyRwJEDzqJGYMB7LJ/bfqb9mWKF1fLvZGk46W5t7TVaXRDD5KHFx9DPWvKn4gRUVkwTHEy262ah5ORh8M6n/6VVVajeV/AYt2C0sswdkDBDO4Xq+xy5gdw3G8s1A4Inbm73pUh+6vx+7ltBbk="
 
 before_install:
-    - sudo apt-add-repository -y ppa:ubuntu-toolchain-r/test --allow-unauthenticated
+    - sudo apt-add-repository -y ppa:ubuntu-toolchain-r/test
     - sudo apt-get update -qq
     - sudo apt-get install -y cmake valgrind g++-multilib libc6-dbg:i386 --allow-unauthenticated