meta: collaborators list nits in README.md

[vsemozhetbyt]

I've compared our user-created list with auto-generated one and found out some differences. FWIW:

1. fishrock123 -> Fishrock123
2. qard -> Qard
3.  

   iWuzHere - Imran Iqbal                       <imran@imraniqbal.org> https://github.com/iWuzHere ->
   imran-iq - Imran Iqbal (Previously iWuzHere)          ?             https://github.com/imran-iq
   

I am not sure if this should be addressed.

_{EDIT: Minor formatting update by @Trott so that `3.` displays correctly above.}

[Trott]

Number 4 is expected. Nothing to address there. It does seem like we ought to address 1, 2, and 3, though.

[vsemozhetbyt]

I've deleted the last case as unnecessary.