Add proppy as comaintainer
Add proppy as comaintainer

armbuilds/golang,infosiftr/golang,tbetbetbe/golang,mattrobenolt/golang,docker-library/golang,armhf-docker-library/golang,Luit/golang,attilaolah/golang,lindenlab/golang,sthapaun/golang,akerbis/armhf-golang,essentier/golang