linter: Update commit title regex to match uppercase for the first letter.
linter: Update commit title regex to match uppercase for the first letter.

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