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I’m undecided

Version upgrade - communication and discount.

I bought the ebook version of the first edition of Learning Swift (covering Swift 2). Now the second edition (for Swift 3) is available. I have to questions:
1) Would it be a good idea to inform buyers of the first edition that the second edition is available? I would have liked that.
2) Would it be a good idea to offer buyers of ebooks an upgrade price for a new version? I would like that :-)

Kind regards
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