Updated minimalmodbus.read_string arg

[limweichiang]

For minimalmodbus.read_string(), the numberOfDecimals was changed to number_of_decimals.

This change took effect as of MinimalModbus 1.0, refer to https://minimalmodbus.readthedocs.io/en/stable/apiminimalmodbus.html#minimalmodbus.Instrument.read_register

Before fixing, the following error was encountered:

$ python3 renogy_rover.py 
Traceback (most recent call last):
  File "renogy_rover.py", line 185, in <module>
    print('Model: ', rover.model())
  File "renogy_rover.py", line 41, in model
    return self.read_string(12, numberOfRegisters=8)
TypeError: read_string() got an unexpected keyword argument 'numberOfRegisters'

[corbinbs]

Hi @limweichiang !

I'm behind on PR reviews! 😅

I hope to catch up on these this weekend.

Thanks for using the library and for sending PRs back!!!!

[limweichiang]

No worries, I love that you built this and I didn't need to spend time hacking something else together. Thanks so much for sharing! Lemme know if you need any help with testing etc, I've got a Renogy Adventurer Li 30A in my setup.

[corbinbs]

@limweichiang thanks again for the PR!

I've merged #13 which will flip the project over to use poetry as well as pick up all of the latest versions of the project's dependencies (like minimalmodbus)

I'm going to merge this PR and try to get some runtime on these changes against my own 40A Renogy Rover before releasing a new library version.

Thanks!