v1.3.0

A misspelt key was silently ignored: "quailty": 60 meant the default quality,
with nothing said about it, and the first sign was output that looked wrong.

Added

• A JSON Schema for the config, shipped in the
  package at schema/poops-images.schema.json. Point $schema at it and the
  editor completes and checks the whole config as you type — see the Config
  file section of the README for both the local and the GitHub URL.
• Unknown config keys are named as they load: [info] unknown key "quailty" — ignored. Valid: …, with the path for nested ones (in sizes[0]). Key names
  only; a wrong type still throws where it always did. A schema file that
  cannot be read leaves the config to load unadvised rather than taking the run
  down over a warning.

Changed

• The config is validated once, in the ImageProcessor constructor, which is
  the one place that cannot trust what it is handed — a library caller can
  build a config without going through the file loader at all. loadConfig()
  now returns the file as read, so anything reading a default off its result
  before handing it to the processor sees undefined where it used to see the
  default. The CLI and the documented new ImageProcessor(config) path behave
  as they did, minus the duplicate warnings.

Full Changelog: v1.2.1...v1.3.0