Update who.md
Update who.md

Added Pomona to the list of who is using GitVersion
asbjornu/GitVersion,onovotny/GitVersion,pascalberger/GitVersion,dazinator/GitVersion,JakeGinnivan/GitVersion,DanielRose/GitVersion,MarkZuber/GitVersion,DanielRose/GitVersion,alexhardwicke/GitVersion,JakeGinnivan/GitVersion,dazinator/GitVersion,ermshiperete/GitVersion,gep13/GitVersion,dpurge/GitVersion,JakeGinnivan/GitVersion,RaphHaddad/GitVersion,onovotny/GitVersion,ermshiperete/GitVersion,onovotny/GitVersion,distantcam/GitVersion,dpurge/GitVersion,ermshiperete/GitVersion,ParticularLabs/GitVersion,ParticularLabs/GitVersion,RaphHaddad/GitVersion,GitTools/GitVersion,JakeGinnivan/GitVersion,pascalberger/GitVersion,Philo/GitVersion,Philo/GitVersion,alexhardwicke/GitVersion,GitTools/GitVersion,gep13/GitVersion,FireHost/GitVersion,pascalberger/GitVersion,dpurge/GitVersion,dpurge/GitVersion,distantcam/GitVersion,FireHost/GitVersion,DanielRose/GitVersion,asbjornu/GitVersion,ermshiperete/GitVersion,MarkZuber/GitVersion