version 1.3 python seems to use statevector heading instead of true_track

[AWSBarker]

I recently install python version onto two machines, pip list reported version 1.3 installed and running, however my code referred to a state vector 'heading' which was flagging an non exist error on one machine but not the other!

I used the suggested install code below on both machines using a virtual environment with python 3.11

pip install https://github.com/openskynetwork/opensky-api/archive/master.zip#subdirectory=python
according to the api documents (version 1.4) 'true_track' appears to have replaced 'heading'

could you clarify the above and confirm how I can download version 1.4?