New Features
* Added a new method, `get_average_power`, to `Packet` to get the average power between the `Packet` and another `Packet` for a given channel index.
* Added a new method, `get_average_pulse_rate`, to `Packet` to get the average pulse rate between the `Packet` and another `Packet` for a given pulse counter index.
**Full Changelog**: https://github.com/sdwilsh/siobrultech-protocols/compare/v0.5.0...v0.6.0