upgrade-zulip-from-git: Remove buggy typing import.
upgrade-zulip-from-git: Remove buggy typing import.

This broke running this on Python 3.4, where typing isn't in stdlib.

synicalsyntax/zulip,punchagan/zulip,timabbott/zulip,eeshangarg/zulip,shubhamdhama/zulip,brainwane/zulip,shubhamdhama/zulip,brainwane/zulip,brainwane/zulip,hackerkid/zulip,brainwane/zulip,andersk/zulip,punchagan/zulip,rht/zulip,shubhamdhama/zulip,synicalsyntax/zulip,shubhamdhama/zulip,rht/zulip,showell/zulip,synicalsyntax/zulip,kou/zulip,kou/zulip,rht/zulip,tommyip/zulip,rht/zulip,timabbott/zulip,timabbott/zulip,rishig/zulip,zulip/zulip,andersk/zulip,showell/zulip,dhcrzf/zulip,punchagan/zulip,kou/zulip,dhcrzf/zulip,dhcrzf/zulip,timabbott/zulip,eeshangarg/zulip,hackerkid/zulip,andersk/zulip,brainwane/zulip,showell/zulip,showell/zulip,tommyip/zulip,andersk/zulip,andersk/zulip,punchagan/zulip,timabbott/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,showell/zulip,dhcrzf/zulip,showell/zulip,dhcrzf/zulip,synicalsyntax/zulip,rht/zulip,kou/zulip,zulip/zulip,rht/zulip,tommyip/zulip,hackerkid/zulip,dhcrzf/zulip,rishig/zulip,kou/zulip,hackerkid/zulip,zulip/zulip,hackerkid/zulip,tommyip/zulip,shubhamdhama/zulip,eeshangarg/zulip,shubhamdhama/zulip,zulip/zulip,zulip/zulip,hackerkid/zulip,eeshangarg/zulip,dhcrzf/zulip,andersk/zulip,punchagan/zulip,andersk/zulip,synicalsyntax/zulip,shubhamdhama/zulip,timabbott/zulip,timabbott/zulip,tommyip/zulip,rishig/zulip,tommyip/zulip,rishig/zulip,synicalsyntax/zulip,rishig/zulip,synicalsyntax/zulip,tommyip/zulip,brainwane/zulip,showell/zulip,punchagan/zulip,rht/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,brainwane/zulip,rishig/zulip,punchagan/zulip,rishig/zulip,hackerkid/zulip,kou/zulip