message: fix dependency issue
diff: @@ -15,7 +15,7 @@ RUN apt-get update -y
  # Install some dependencies
  # http://airbnb.io/superset/installation.html#os-dependencies
  RUN apt-get update -y && apt-get install -y build-essential libssl-dev \
  - libffi-dev python3-dev libsasl2-dev libldap2-dev
  + libffi-dev python3-dev libsasl2-dev libldap2-dev libxi-dev
  RUN apt-get install -y vim less postgresql-client redis-tools
  