Add 2.7 stubs for dict.fromkeys(). Fixes mypy #1176.
Add 2.7 stubs for dict.fromkeys(). Fixes mypy #1176.

fyquah95/typeshed,li-dan/typeshed,tharvik/typeshed,fyquah95/typeshed,euresti/typeshed,azag0/typeshed,tharvik/typeshed