Update comment of Virtus::Attribute::Hash#new_hash
Update comment of Virtus::Attribute::Hash#new_hash

Issue #98

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