message: Fix heredoc
  Fix apt source
diff: @@ -33,7 +33,8 @@ matrix:
  addons:
  apt:
  sources:
  - - ubuntu-toolchain-r-test
  + #- ubuntu-toolchain-r-test
  + - sourceline: 'ppa:ubuntu-toolchain-r/test'
  packages:
  - clang
  - iodbc
  