Bump json development dependency to ~> 1.6.4
Bump json development dependency to ~> 1.6.4

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