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bpo-28556: Various updates to typing (#28)

various updates from upstream python/typing repo:

- Added typing.Counter and typing.ChainMap generics
- More flexible typing.NamedTuple
- Improved generic ABC caching
- More tests
- Bugfixes
- Other updates

* Add Misc/NEWS entry

* Add issue number
I
Ivan Levkivskyi committed
b692dc8475a032740576129d0990ddc3edccab2b
Parent: 3cdbd68
Committed by Mariatta <Mariatta@users.noreply.github.com> on 2/13/2017, 9:50:14 PM