message: updating osx build matrix according to this:
diff: @@ -203,24 +203,14 @@ matrix:
  osx_image: xcode8.3
  os: osx
  - # Xcode 9 Clang
  - - env: COMPILER=clang++ HAS_ASAN_32=true HAS_UBSAN_32=true HAS_ASAN_64=true HAS_UBSAN_64=true
  - osx_image: xcode9
  - os: osx
  -
  - # Xcode 9.1 Clang
  - - env: COMPILER=clang++ HAS_ASAN_32=true HAS_UBSAN_32=true HAS_ASAN_64=true HAS_UBSAN_64=true
  - osx_image: xcode9.1
  - os: osx
  -
  # Xcode 9.2 Clang
  - env: COMPILER=clang++ HAS_ASAN_32=true HAS_UBSAN_32=true HAS_ASAN_64=true HAS_UBSAN_64=true
  osx_image: xcode9.2
  os: osx
  - # Xcode 9.3 Clang
  + # Xcode 9.4 Clang
  - env: COMPILER=clang++ HAS_ASAN_32=true HAS_UBSAN_32=true HAS_ASAN_64=true HAS_UBSAN_64=true
  - osx_image: xcode9.3
  + osx_image: xcode9.4
  os: osx
  # OSX GCC 4.9
  