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Update CONTRIBUTING.md (#1250)

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Add Python type hints and mypy
C
Christian Clauss committed
df44d1b703d756f965f0085ac05e91810b8e9c21
Parent: b738281
Committed by Anup Kumar Panwar <1anuppanwar@gmail.com> on 10/2/2019, 4:19:00 PM