html-grep: Replace optparse with argparse.
html-grep: Replace optparse with argparse.

Tweated by tabbott to still have a useful description.

tommyip/zulip,hackerkid/zulip,mahim97/zulip,dhcrzf/zulip,kou/zulip,timabbott/zulip,brockwhittaker/zulip,jackrzhang/zulip,amanharitsh123/zulip,kou/zulip,jackrzhang/zulip,showell/zulip,brockwhittaker/zulip,dhcrzf/zulip,andersk/zulip,synicalsyntax/zulip,shubhamdhama/zulip,dhcrzf/zulip,showell/zulip,brainwane/zulip,showell/zulip,tommyip/zulip,eeshangarg/zulip,showell/zulip,andersk/zulip,zulip/zulip,jackrzhang/zulip,shubhamdhama/zulip,brockwhittaker/zulip,zulip/zulip,timabbott/zulip,dhcrzf/zulip,amanharitsh123/zulip,dhcrzf/zulip,punchagan/zulip,eeshangarg/zulip,rht/zulip,jackrzhang/zulip,eeshangarg/zulip,zulip/zulip,brainwane/zulip,jackrzhang/zulip,brockwhittaker/zulip,shubhamdhama/zulip,tommyip/zulip,andersk/zulip,hackerkid/zulip,showell/zulip,synicalsyntax/zulip,rishig/zulip,rht/zulip,brainwane/zulip,shubhamdhama/zulip,timabbott/zulip,kou/zulip,punchagan/zulip,kou/zulip,amanharitsh123/zulip,mahim97/zulip,rht/zulip,brainwane/zulip,shubhamdhama/zulip,Galexrt/zulip,amanharitsh123/zulip,timabbott/zulip,rishig/zulip,Galexrt/zulip,Galexrt/zulip,shubhamdhama/zulip,brainwane/zulip,eeshangarg/zulip,rishig/zulip,tommyip/zulip,eeshangarg/zulip,synicalsyntax/zulip,showell/zulip,dhcrzf/zulip,mahim97/zulip,brockwhittaker/zulip,rht/zulip,eeshangarg/zulip,amanharitsh123/zulip,showell/zulip,mahim97/zulip,andersk/zulip,Galexrt/zulip,Galexrt/zulip,andersk/zulip,brainwane/zulip,tommyip/zulip,brockwhittaker/zulip,timabbott/zulip,rishig/zulip,mahim97/zulip,jackrzhang/zulip,amanharitsh123/zulip,hackerkid/zulip,synicalsyntax/zulip,tommyip/zulip,hackerkid/zulip,Galexrt/zulip,andersk/zulip,punchagan/zulip,hackerkid/zulip,punchagan/zulip,rishig/zulip,dhcrzf/zulip,andersk/zulip,kou/zulip,zulip/zulip,kou/zulip,hackerkid/zulip,rht/zulip,brainwane/zulip,punchagan/zulip,synicalsyntax/zulip,tommyip/zulip,jackrzhang/zulip,Galexrt/zulip,zulip/zulip,punchagan/zulip,synicalsyntax/zulip,shubhamdhama/zulip,rht/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,rishig/zulip,timabbott/zulip,timabbott/zulip,punchagan/zulip,synicalsyntax/zulip,rishig/zulip,hackerkid/zulip,zulip/zulip,mahim97/zulip,rht/zulip