Release 5.0.0-rc.1

• Requires react-native >= 0.60
• This release includes Branch native SDKs Android 5.0.1 and iOS 0.34.0.
• The onOpenStart function is now called for Universal Links on iOS when
  launched from a link, and the uri parameter is populated in the
  onOpenComplete callback in this case.
• The return value of branch.subscribe() did not work as an unsubscribe
  function. This has been fixed.
• Add support for all standard v2 events.
• Add support for an alias property in Branch v2 events (also known as
  Customer Event Alias).