mypy: Improve constraint on return types in statsd_increment decorator.
mypy: Improve constraint on return types in statsd_increment decorator.

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