[docs] [issue18231] What's new in Python should explain what's new in UCD

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

MvL> Are you sure that the permission to use "KHMER VOWEL INHERENT AQ"
MvL> in an identifier is worth mentioning?

No, but it is worth mentioning that there are no more substantial changes.  I don't think the change from 6.1.0 to 6.2.0 has any effect on python programs that don't explicitly use unicodedata module. ("Version 6.2 of the Unicode Standard is a special release dedicated to the early publication of the newly encoded Turkish lira sign.") If this is true, I think What's New in 3.4 can just say that.  The change from 6.1.0 to 6.2.0 is more substantial, so I think it is worth mentioning a few effects so that users don't have to wonder what the upgrade means for them.  The effect of the change on Python language and builtins is not at all obvious from the Unicode's own summary of changes.

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<http://bugs.python.org/issue18231>
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