message: Update Dockerfile to Node 8
diff: -FROM node:boron
  +FROM node:8
  RUN apt-get update \
  && apt-get install -y \
  @@ -40,7 +40,7 @@ RUN mkdir -p /code
  WORKDIR /code
  COPY ./package.json ./yarn.lock /code/
  -RUN yarn --pure-lockfile
  +RUN yarn --pure-lockfile --ignore-engines
  COPY ./.bowerrc /code/.bowerrc
  COPY ./bower.json /code/bower.json
  