Validating US numbers with area code 689

[NicolayD]

Hi, thank you for the helpful library you've built.

I stumbled upon a problem validating US phone numbers with area code 689 which seems to be a fairly new (several years old) phone area code for somewhere in Florida, at least according to this article.

When I test at https://libphonenumber.appspot.com with a number such as +16894023931 it validates it successfully, but this returns false:

> {:ok, parsed_phone} = ExPhoneNumber.parse("+16894023931", "US")
> ExPhoneNumber.is_valid_number?(parsed_phone)
false

[szymon-jez]

Thank you very much for your kind words.

Work is being done (regrettably it staled...) in #43 to address such issues like yours by updating the metadata that is used to determine if a number is valid or not etc.

Closing this issue as it will be solved by #43.