Add missing priorities

[eemeli]

After the update to 0.6.0, my tests started failing due to this:

import { allCountryCodes } from 'country-telephone-data'
allCountryCodes['1']
// [ 'um', 'ca', 'do', 'pr' ]

The country codes added in PR #9 did not include priorities, which are added here.

[mukeshsoni]

@eemeli There are some conflicts. Can you resolve them please?

[eemeli]

Sorry, not going to be able to do that anytime soon. Your commit 296922d reformatted everything, so it isn't possible to apply any earlier PRs without manually recreating them from scratch.