mypy: Migrate lib/debug.py to python3.5 annotations.
mypy: Migrate lib/debug.py to python3.5 annotations.

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