Change only() to flag instead of alias of valid() #1978
Description
Before, only(1) was an alias to valid(1). This changes it to a flag where Joi.allow(1).only() is the same as Joi.valid(1).
{{ message }}
Before, only(1) was an alias to valid(1). This changes it to a flag where Joi.allow(1).only() is the same as Joi.valid(1).