message: Add note with regards to numpy issue on travis macos
diff: @@ -17,6 +17,7 @@ matrix:
  osx_image: xcode9.2
  install:
  + # numpy issue: https://github.com/travis-ci/travis-ci/issues/6688
  - |
  if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
  wget https://cmake.org/files/v3.8/cmake-3.8.2-Linux-x86_64.tar.gz
  