Parses the JSON returned by the ADS-B Exchange API.
This crate currently only supports v2 of the API.
To parse a v2 JSON response:
use Response;
use FromStr;
# let json_str = include_str!;
let response = from_str.unwrap;
println!;
let ac = &response.aircraft;
println!;
if let Some = &ac.registration
if let =