removing 'changes' section from the online edition

[Eitan Adler]

Hi all,

The Preface has a few sections 'Changes from the ____ Edition' which
enumerate changes made between print editions of the book.  I would
like to drop them from the online edition as they offer little value
and are right at the start of the handbook ('prime real estate').

They can be retained in the print edition where they offer a little more value.

Does anyone see a reason to keep them in the online version?

-- 
Eitan Adler