[docs] [issue28635] Update What's New for 3.6

[Elvis Pranskevichus]

Elvis Pranskevichus added the comment:

Thanks Serhiy.  I removed mentions of things that were indeed fixes backported to 3.5.  Other issue references are valid news, including new features to provisional modules backported to 3.5.  It is customary to include these in the news for the major release.

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Added file: http://bugs.python.org/file45430/0001-Issue-28635-what-s-new-in-3.6-remove-mentions-of-bac.patch

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