No documentation for new update prop as well as a bug

[northkode]

I think there is a bug with 2.1.1 version.

The singleSpaProps object that is online 49 is null.. and the chooseDomElementGetter function passing in opts and singleSpaProps but if singleSpaProps == null the code completely dies and crashes the app

This should be optional and default to a blank {} object then line 92 - 97 would run for backwards compatibility