Update rcov configuration to fail if coverage drops
Update rcov configuration to fail if coverage drops

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