Update cli.py

[5foot8]

I added the altitude 'filter' in line 70 so that the camera was not constantly following the landing aircraft at the local airport. I wanted to be able to identify the aircraft that were going 'over-the-top'.

I live so close to the final approach at my local airport the camera was fixated on following these landing planes because they were always the closest aircraft, I'm literally less than 2 miles from the approach line.

I don't have the coding skills to add this as an option in the command line options - but I'm guessing it would be a simple addition, my attempt ended badly. I chose 30000 feet as my boundary as this is supposedly the area where contrails are most likely to be started to be produced.

[5foot8]

This modification was purely to cut down on the constant following of the landing aircraft as they were always the closest to the camera at less than 3 Km and 1500 ft altitude. By setting a higher flight-level to follow you have a much more wider outlook. With the landing aircraft never more than 3 minutes apart during busy hours the camera was constantly just tracking these landing aircraft.