v13.8.6

Add CdvPurchase.Utils.platformName()

Convert CdvPurchase.Platform enum values to a more user friendly version.

Usage:

console.log(CdvPurchase.Utils.platformName(myTransaction.platform));

// returns "App Store" or "Google Play" or "Braintree", ....

Increase expiry monitor's grace period on Google Play

The 10 seconds wait before refreshing an expired subscription on Google Play wasn't enough: increased to 30 seconds.

Ref #1468