message: Remove several not needed builds from Travis and add macOS 10.13
diff: @@ -37,24 +37,16 @@ matrix:
  osx_image: xcode7.3 # OS X 10.11
  compiler: clang
  env: BUILD_TYPE=normal BUILD_WITH=cmake COVERAGE=llvm
  - - os: osx
  - osx_image: xcode7.3 # OS X 10.11
  - compiler: clang
  - env: BUILD_TYPE=normal BUILD_WITH=autoconf COVERAGE=llvm
  - os: osx
  osx_image: xcode8.3 # macOS 10.12
  compiler: clang
  env: BUILD_TYPE=normal BUILD_WITH=cmake COVERAGE=llvm
  - os: osx
  - osx_image: xcode8.3 # macOS 10.12
  - compiler: clang
  - env: BUILD_TYPE=normal BUILD_WITH=autoconf COVERAGE=llvm
  - - os: osx
  - osx_image: xcode9.1 # macOS 10.12
  + osx_image: xcode9.3 # macOS 10.13
  compiler: clang
  env: BUILD_TYPE=normal BUILD_WITH=cmake COVERAGE=llvm
  - os: osx
  - osx_image: xcode9.1 # macOS 10.12
  + osx_image: xcode9.3 # macOS 10.13
  compiler: clang
  env: BUILD_TYPE=normal BUILD_WITH=autoconf COVERAGE=llvm
  - os: linux
  