[issue19731] Fix copyright footer

[Terry J. Reedy]

Terry J. Reedy added the comment:

As I first noted, 1990 is before the first release of Python in 1992, so that seemed to be too early. I think Marc-Andre's fix is good enough and should be applied.

Victor, you want something weird? You can probably find technical books now copyrighted '2014'. Publishers sometime postdate (lie) so the book will not seem obsolete so soon. But is does not mean that it is not copyrighted (protected) now.

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nosy: +terry.reedy

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