message: Travis: update to xenial
diff: language: cpp
  os: linux
  -dist: trusty
  +dist: xenial
  sudo: required
  cache:
  @@ -89,7 +89,7 @@ matrix:
  apt:
  sources:
  - *default_sources
  - - llvm-toolchain-trusty-7
  + - llvm-toolchain-xenial-7
  packages:
  - *default_packages
  - clang-7
  @@ -97,3 +97,17 @@ matrix:
  - env: CMAKE_CXX_COMPILER=clang++-7 CMAKE_BUILD_TYPE=Release
  addons: *clang7
  +
  + - env: CMAKE_CXX_COMPILER=clang++-8 CMAKE_BUILD_TYPE=Debug CMAKE_CXX_FLAGS=-fsanitize=address,undefined
  + addons: &clang8
  + apt:
  + sources:
  + - *default_sources
  + - llvm-toolchain-xenial-8
  + packages:
  + - *default_packages
  + - clang-8
  + - g++-8
  +
  + - env: CMAKE_CXX_COMPILER=clang++-8 CMAKE_BUILD_TYPE=Release
  + addons: *clang8
  