Add information about coercions to README file
Add information about coercions to README file

lgierth/virtus,faucct/virtus,XescuGC/virtus,hapiben/virtus,mallikarjunayaddala/virtus,kristianmandrup/virtus,nuclearsandwich/virtus,artemeff/virtus,reevoo/virtus,solnic/virtus,dslh/virtus,baojjeu/virtus,JustMikey/virtus,macressler/virtus