providers: List data providers

curl 'https://api.frankfurter.dev/v2/providers'

import requests

resp = requests.get("https://api.frankfurter.dev/v2/providers")
data = resp.json()

import zingu_apis

api = zingu_apis.api("frankfurter")
result = api.fetch("providers")

for item in result:
    print(item)

const resp = await fetch("https://api.frankfurter.dev/v2/providers");
const data = await resp.json();