message: Install httpie via pip instead of choco.
  Something seems to be wrong with the choco httpie installation process
  at the moment:
diff: @@ -23,7 +23,7 @@ jobs:
  - python -m pip install --upgrade pip
  - pip3 install --upgrade pip
  - pip3 install awscli
  - - choco install httpie
  + - pip3 install httpie
  - "./travis/travis-get-ue.sh"
  before_script:
  - export CESIUM_UNREAL_VERSION=$(git describe)
  