message: travis: only check style in docker build
  The astyle download is not available anymore, however, it's enough to
  check the style inside docker.
diff: @@ -56,11 +56,6 @@ addons:
  install:
  - set -e
  -- if [[ "${BUILD_TARGET}" = "gcc_build" ]]; then
  - mkdir -p ~/bin;
  - wget -O ~/bin/astyle https://github.com/PX4/astyle/releases/download/2.05.1/astyle-linux;
  - chmod +x ~/bin/astyle;
  - fi
  - if [[ "${BUILD_TARGET}" = "docker_build" ]]; then
  pip install --user awscli;
  $(aws ecr get-login --region eu-central-1);
  @@ -71,7 +66,6 @@ script:
  - if [[ "${BUILD_TARGET}" = "gcc_build" ]]; then
  make;
  make run_unit_tests;
  - make fix_style;
  fi
  - if [[ "${BUILD_TARGET}" = "docker_build" ]]; then
  docker run -it -v $TRAVIS_BUILD_DIR:/home/docker1000/src/DroneLink:rw ${DOCKER_REPO} make;
  