message: update dockerfile to use latest autorest
diff: -FROM ubuntu:xenial
  +FROM ubuntu:bionic
  LABEL maintainer="fearthecowboy"
  # Required for install
  -RUN apt-get update && apt-get install -y curl libunwind8 libicu55
  +RUN apt-get update && apt-get install -y curl libunwind8 libicu60
  # NodeJS
  -RUN curl -sL https://deb.nodesource.com/setup_8.x | bash - && \
  +RUN curl -sL https://deb.nodesource.com/setup_10.x | bash - && \
  apt-get update && apt-get install -y nodejs && \
  npm install npm@latest -g
  # Autorest
  -RUN npm install -g autorest@preview
  +RUN npm install -g autorest@latest
  RUN autorest --reset --allow-no-input --csharp --ruby --python --java --go --nodejs --typescript --azure-validator --preview
  # Set the locale to UTF-8
  