update ghostscript to 9.20 (#1062)
update ghostscript to 9.20 (#1062)


rodericktech/scoop,bpollack/scoop,coonce/scoop,Congee/scoop,vidarkongsli/scoop,nueko/scoop,nikolasd/scoop,rmyorston/scoop,vinaynambiar/lukesampson-,rasa/scoop,berwyn/scoop,lukesampson/scoop,Cyianor/scoop,toxeus/scoop,r15ch13/scoop,kodybrown/scoop,yunspace/scoop,reelsense/scoop