doc: move orangemocha to collaborators list
Checklist
-
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc
Description of change
I IRC'ed with @orangemocha before doing this. He's doing other things right now and didn't think he'd get to this until next week anyway, and was fine with me doing it for him. Since I'm tidying up one or two other .md files right now...