message: Add setuptools and cache pip installation
diff: @@ -3,6 +3,9 @@ dist: xenial
  sudo: required
  git:
  depth: 3
  +cache:
  + directories:
  + - $HOME/.cache/pip
  env:
  matrix:
  # Only examples and associated tests
  @@ -41,7 +44,7 @@ install:
  - make all
  - sudo make install
  - cd ..
  - - pip3 install Cython sphinx sphinxcontrib-bibtex matplotlib numpy
  + - pip3 install setuptools Cython sphinx sphinxcontrib-bibtex matplotlib numpy
  script:
  - mkdir -p build
  - cd build
  