message: fix(build): added python installation in Dockerfile
diff: FROM node:9-slim
  # See https://crbug.com/795759
  -RUN apt-get update && apt-get install -yq libgconf-2-4 bzip2 build-essential
  +RUN apt-get update && apt-get install -yq libgconf-2-4 bzip2 build-essential python
  RUN apt-get install -yq git
  # Install latest chrome dev package and fonts to support major charsets (Chinese, Japanese, Arabic, Hebrew, Thai and a few others)
  