Update copyright. The four year increment is intentional (to save work).
Missed one copyright.
Fix two typos.
Add libmpdec license.
Issue #15475: Add __sizeof__ implementations for itertools objects.
Merge 3.3.
Fix whitespace.
Fix typo.
Issue #19932: Fix typo in import.h, missing whitespaces in function prototypes.
(Merge 3.3) Issue #19932: Fix typo in import.h, missing whitespaces in function prototypes.
assyncio doc: rewrite, improve and move coroutine, Future and Task examples
asyncio doc: rewrite the callback hello world to use call_soon() instead of a
direct call.
asyncio: fix 2nd task example
asyncio: don't document private functions
Issue 19851: Fix a regression in reloading submodules.
Remove commented-out module spec test code and an out-of-date note.