on windows, resolve proactor and selector event loop policies only for python 3.7 and newer (#3866)
on windows, resolve proactor and selector event loop policies only for python 3.7 and newer (#3866)

Signed-off-by: Oleg Höfling <5372a8938f37931bff856e791e71bfdb147a99f0@gmail.com>
euresti/typeshed