[docs] [issue28810] Document bytecode changes in 3.6

[Brett Cannon]

Brett Cannon added the comment:

If the "ping" is for me, I spent my open source day last week reviewing the dependency for this issue (and other stuff) so I plan to get to this PR this Friday.

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