{demonym}: Get countries by demonym

curl 'https://restcountries.com/v3.1/demonym/german'

import requests

resp = requests.get("https://restcountries.com/v3.1/demonym/german")
data = resp.json()

import zingu_apis

api = zingu_apis.api("rest-countries")
result = api.fetch("demonym/{demonym}")

for item in result:
    print(item)

const resp = await fetch("https://restcountries.com/v3.1/demonym/german");
const data = await resp.json();