appveyor: use postgres' zic
appveyor: use postgres' zic
Bachmann1234/dateutil,sprymix/dateutil,abalkin/dateutil,abalkin/dateutil,sprymix/python-dateutil,pganssle/dateutil-test-codecov,mjschultz/dateutil,pganssle/dateutil-test-codecov,jenshnielsen/dateutil