Update validation: phone valid if one country is valid

[shqear93]

validates :attribute, phone: { allow_blank: true, countries: [:us, :ca] }

Phone number should be valid if it's at least valid for one country from the provided list

[daddyz]

@shqear93 nice PR, can you make this behavior optional, maybe via config param? And additionally this behavior doesn't respect possible param, this is required too

[shqear93]

@daddyz I'll work on that soon