• Support for new Offerings system.
• Deprecates makePurchase methods. Replaces with purchasePackage
• Deprecates getEntitlements method. Replaces with getOfferings
• See our migration guide for more info: https://docs.revenuecat.com/v3.0/docs/offerings-migration
• Updates to BillingClient 2.0.3. If finishTransactions is set to false (or observerMode is true when configuring the SDK),
  this SDK won't acknowledge any purchase and you have to do it yourself.
• Adds proration mode support on upgrades/downgrades
• Adds more PurchaserInfo missing properties. activeEntitlements, expirationsForActiveEntitlements
  and purchaseDatesForActiveEntitlements have been removed from PurchaserInfo
• intro_price, intro_price_period_number_of_units and intro_price_cycles are a number now or null instead of empty
  strings, intro_price_period_unit can also be null.
• Added Typescript types (#72)
• New identity changes:
  • The .createAlias() method is no longer required, use .identify() instead
  • .identify() will create an alias if being called from an anonymous ID generated by RevenueCat
  • Added an isAnonymous property to Purchases.sharedInstance
  • Improved offline use