prettier

[travi]

i'd like prettier to be an assumed default in newly generated projects, but want to make sure all things are covered before that assumption is too strongly expected.

• where to the dependencies get installed (probably directly in the js-scaffolder?)
• how does this interact with eslint?
  • does there need to be a separate eslint-config, or should this be included in the base eslint-config as a more universal assumption?
  • if included in the base-config, probably needs to be considered a breaking change
• should there be a package for a shareable prettier config?