[docs] [issue28810] Document bytecode changes in 3.6

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Several third-party bytecode manipulating projects still are not updated to 3.6. Correct documentation is needed for them. Could anyone please make a review of the patch (or maybe totally rewrite it)?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28810>
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