Sorry, that change seems to have been missing from the release notes. It needs to be this signature now
Code:
Public Overrides Function Read(ByVal parStream As System.IO.Stream, ByVal document As Document, ByVal parEncoding As System.Text.Encoding) As Documents.DocumentText
The underlying change is that the document object's Title property is now used (in addition to the Uri) to create a searchable (but invisible) footer. We did this to get the title out of the result summaries.
Let me know if you're unsure how to implement it.
-your feedback is helpful to other users, thank you!