Wrong .json data for usa.json cities

[7krasov]

Hi, @antonioribeiro ! Thanks a lot for your great package!

Would like to notify you about wrong data in https://raw.githubusercontent.com/antonioribeiro/countries/master/src/data/cities/default/usa.json

after 2nd city item (abilene key) there is excess data (seems mistakenly copy-pasted)

"adm0_a3": "USA",
"adm0cap": "0.00000000000",
"adm0name": "United States of America",
"adm1name": "Alaska",
"admin1_cod": "0.00000000000",

among cities array items and makes complexity during iteration process.

Sorry, don't know whether this file should be changed + committed or it t comes from another source so just leave you this notification without any pull request.