7.0.0

Change log since v6.0.0

• (android) Add price_amount_micros to product data (#531)
• (android) Add ability in android to upgrade a user existing subscription
• (android) Add developerPayload option
• (android) Preventing crash on java.lang.NullPointerException (#485)
• (android) Fix null transactions -- test purchases have no more an order id (#577, #581)
• (windows-10) Changes for durable and consumable purchases (#459)
• (ios) Handle nil transaction.originalTransaction when transaction restored
• (ios) Remove finished transactions from product.transactions for consumables and non-renewing subscriptions.
• (ios) Trigger product error event on storekit error.
• (ios) Disable appStoreReceipt caching (4d553aa)
• (all) Documentation updates (#609, #595, #584, #535)