{capital}: Search countries by capital city

curl 'https://restcountries.com/v3.1/capital/london'

import requests

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

import zingu_apis

api = zingu_apis.api("world-countries")
result = api.fetch("capital/{capital}")

for item in result:
    print(item)

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