Remove unnecessary source from llvm
@@ -62,7 +62,6 @@ matrix:
before_install:
- curl -L http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt-key add -
- sudo apt-add-repository -y 'deb http://llvm.org/apt/trusty llvm-toolchain-trusty-4.0 main'
- - sudo apt-add-repository -y 'deb http://llvm.org/apt/trusty llvm-toolchain-trusty main'
- sudo apt-get --yes update
- sudo apt-get install -y clang-4.0
- sudo add-apt-repository --yes ppa:ubuntu-toolchain-r/test
