dump1090-mutability does not include data.json

[notsureofagoodname]

Hi There,

Rebooted my rPi and came back with a fun issue. After upgrading dump1090-mutability, there's no longer a data.json file. I moved to the closest file that is referenced in the API, which is data/aircraft.json - https://github.com/mutability/dump1090/blob/master/net_io.c#L1364 it's formatted totally differently. To resolve the issue I ended up building an older version of dump1090 from source that contained the data.json file. No data.json file triggers an issue on https://github.com/Syps/alexa-airplane-spotter/blob/master/nearby.py#L157. data/aircraft.json does not work as a sub.