setup.py has undeclared dependency on 'bitstring'

[TreyBoudreau]

The setup.py lacks a mention of the bitstring package:

aprspy/setup.py

Line 21 in c289ecc

install_requires=[

The requirements.txt file lists it correctly:

aprspy/requirements.txt

Line 2 in c289ecc

bitstring==3.1.6

This causes failure at import time:

Traceback (most recent call last):
  File "/blah/blah/import-test.py", line 5, in <module>
    import aprspy
  File "/blah/blah/venv/lib/python3.10/site-packages/aprspy/__init__.py", line 11, in <module>
    from .packets.generic import GenericPacket
  File "/blah/blah/venv/lib/python3.10/site-packages/aprspy/packets/generic.py", line 11, in <module>
    from bitstring import Bits
ModuleNotFoundError: No module named 'bitstring'

One can work around it, obviously, but fixing it won't hurt :-)