[3.8] Turn off AppVeyor CI (GH-15929)#15941

Merged

zware merged 1 commit intopython:3.8from

zware:backport-6f55b03-3.8

Sep 11, 2019

Commits on Sep 11, 2019

[3.8] Turn off AppVeyor CI (GH-15929).
zware
committed