v19.1.0

• #2453 add missing fetchEvent type for UnknownEventNotification

  • Add missing fetchEvent() declaration to the Stripe.Events.UnknownEventNotification interface
  • Tweak Stripe.Events.fetchRelatedObject so that it's always defined and returns null if there's no related_object. This fixes the situation where the UnknownEventNotification says that fetchRelatedObject() is defined, but calling it throws an error.

• #2447 Update param in deprecation docs link

• #2444 Update CHANGELOG.md to point to right API version

See the changelog for more details.