ExRule removed - but still shown in README

[bradleygore]

I was trying to figure out why I couldn't use rrule.Set.ExRule locally, as it's shown in the README, then found it's not listed in the code anywhere. I went back in the history of the file, and it did used to be there, but was removed.

Is there a specific reason why it was removed?
Should the examples in the README get a refresh?

[zensh]

Thank you.