v0.2.0

Added

• AppReview now has an app_version property which contains the version
  of the app that was reviewed.

Changed

• App reviews are now fetched from the iTunes API's customer review feeds
  instead of the private backend API of the App Store. This improves
  performance significantly and makes hitting rate limits much less likely.

• As a consequence, the default delay for AppStoreSession has been
  changed to 0 (no waiting time between requests) and the defaults for
  retry and backoff have also been tweaked.

Deprecated

• The review property of AppReview has been renamed to content.
  Using review still works for the time being, but produces a deprecation
  warning.

Removed

• As the iTunes feed does not return developer responses to app reviews,
  the developer_response field of AppReview has been removed.