Support for Subscription Price

[adhyapranata]

Hi kenn, a really nice gem! I'm curious. Could you add a new feature to fetch subscription pricing matrix like the one showed here: https://developer.apple.com/app-store/subscriptions/App-Store-Subscription-Pricing.pdf?

[kenn]

Is it compatible with the current way? If so, I would appreciate if you (or anyone else) could write up a pull request. If not, I would appreciate if you could tell me if the data is accessible outside of the PDF file.