v0.13 - get app store versions, beta feedback

• Added platform shortcut to get_apps method.
• Added get_app_store_versions method (optionally with localizations).
• Added beta feedback screenshot and crash convenience methods.

v0.12 - jwt_payload

'jwt_payload' option to support the Apple Store Server API.

v0.11 - Test suite fixes

Test suite fixes & improvements.

v0.1 - Initial release

v0.1 - Initial public release