mypy: Use Python 3 type syntax in zerver/webhooks/trello/tests.py.
mypy: Use Python 3 type syntax in zerver/webhooks/trello/tests.py.

zulip/zulip,timabbott/zulip,jackrzhang/zulip,eeshangarg/zulip,jackrzhang/zulip,jackrzhang/zulip,andersk/zulip,tommyip/zulip,zulip/zulip,showell/zulip,kou/zulip,andersk/zulip,punchagan/zulip,showell/zulip,mahim97/zulip,hackerkid/zulip,showell/zulip,synicalsyntax/zulip,andersk/zulip,rishig/zulip,hackerkid/zulip,shubhamdhama/zulip,kou/zulip,punchagan/zulip,andersk/zulip,kou/zulip,mahim97/zulip,rishig/zulip,rht/zulip,tommyip/zulip,dhcrzf/zulip,showell/zulip,brainwane/zulip,tommyip/zulip,punchagan/zulip,brainwane/zulip,synicalsyntax/zulip,mahim97/zulip,eeshangarg/zulip,timabbott/zulip,andersk/zulip,punchagan/zulip,showell/zulip,synicalsyntax/zulip,timabbott/zulip,andersk/zulip,timabbott/zulip,rht/zulip,brainwane/zulip,tommyip/zulip,eeshangarg/zulip,rishig/zulip,tommyip/zulip,timabbott/zulip,dhcrzf/zulip,zulip/zulip,dhcrzf/zulip,zulip/zulip,synicalsyntax/zulip,brainwane/zulip,tommyip/zulip,shubhamdhama/zulip,zulip/zulip,punchagan/zulip,rht/zulip,rishig/zulip,dhcrzf/zulip,shubhamdhama/zulip,kou/zulip,kou/zulip,synicalsyntax/zulip,hackerkid/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,eeshangarg/zulip,punchagan/zulip,mahim97/zulip,eeshangarg/zulip,jackrzhang/zulip,shubhamdhama/zulip,dhcrzf/zulip,rht/zulip,brainwane/zulip,showell/zulip,mahim97/zulip,timabbott/zulip,rht/zulip,rishig/zulip,hackerkid/zulip,jackrzhang/zulip,rht/zulip,rht/zulip,timabbott/zulip,zulip/zulip,synicalsyntax/zulip,kou/zulip,shubhamdhama/zulip,showell/zulip,dhcrzf/zulip,rishig/zulip,brainwane/zulip,kou/zulip,dhcrzf/zulip,shubhamdhama/zulip,eeshangarg/zulip,punchagan/zulip,jackrzhang/zulip,mahim97/zulip,shubhamdhama/zulip,hackerkid/zulip,synicalsyntax/zulip,rishig/zulip,hackerkid/zulip,hackerkid/zulip,brainwane/zulip,tommyip/zulip,jackrzhang/zulip