Update validator to 3.5.0 and bump version to 2.1.0
Update validator to 3.5.0 and bump version to 2.1.0

jg3526/express-validator,Jakeii/express-validator,ctavan/express-validator,carlitux/koa-async-validator,h3dx0/express-validator,ghostRider1124/express-validator,ctavan/express-validator,phuson/express-validator,AndrasEszes/express-validator,supasate/express-validator