message: add melodic CI
diff: @@ -13,10 +13,12 @@ env:
  - ROS_DISTRO=indigo UPSTREAM_WORKSPACE=debian
  - ROS_DISTRO=kinetic UPSTREAM_WORKSPACE=file
  - ROS_DISTRO=kinetic UPSTREAM_WORKSPACE=debian
  + - ROS_DISTRO=melodic UPSTREAM_WORKSPACE=file
  + - ROS_DISTRO=melodic UPSTREAM_WORKSPACE=debian
  matrix:
  allow_failures:
  - - env: ROS_DISTRO=indigo UPSTREAM_WORKSPACE=debian
  - - env: ROS_DISTRO=kinetic UPSTREAM_WORKSPACE=debian
  + - env: ROS_DISTRO=melodic UPSTREAM_WORKSPACE=file
  + - env: ROS_DISTRO=melodic UPSTREAM_WORKSPACE=debian
  install:
  - git clone https://github.com/ros-industrial/industrial_ci.git .ci_config
  script:
  