message: Refactor Travis CI build scripts
  We can now switch to language: cpp and don't need to setup CMake path
  manually.
diff: -language: sh
  +language: cpp
  matrix:
  include:
  - os: linux
  - env:
  - - CC=gcc
  - - CXX=g++
  + compiler: gcc
  - os: linux
  - env:
  - - CC=clang
  - - CXX=clang++
  + compiler: clang
  - os: osx
  + compiler: clang
  - os: windows
  env:
  - TARGET="Visual Studio 15 2017"
  @@ -18,9 +15,6 @@ matrix:
  env:
  - TARGET="Visual Studio 15 2017 Win64"
  -before_script:
  - - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then PATH=$PATH:/c/Program\ Files/CMake/bin; fi
  -
  script:
  - if [[ "$TRAVIS_OS_NAME" != "windows" ]]; then make config=release; fi
  - if [[ "$TRAVIS_OS_NAME" != "windows" ]]; then make config=coverage test; fi
  