v0.14.0 — mapError

Found running dendra in production. No breaking changes.

• .mapError() maps the app's own errors to DendraErrors in one place,
  instead of a try/catch in every handler
  (#77, found running dendra in
  production). It covers every guard and handler on every transport, after-hooks
  see the mapped code, and the original is kept as cause. New type
  ErrorMapper.

Reference: https://products.techfoundry.io/dendra/reference/router/#maperrorfn