在travis中使用conda安装VTK

before_install:
  - sudo apt-get update
  - sudo apt-get install -y libgl1-mesa-dev
  - wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh
  - bash miniconda.sh -b -p $HOME/miniconda
  - export PATH="$HOME/miniconda/bin:$PATH"
  - hash -r
  - conda config --set always_yes yes --set changeps1 no
  - conda update -q conda

install:
  - conda create -q -n test-environment python=3.7
  - source activate test-environment
  - conda install -c conda-forge vtk

script:
  - python your_test_script.py