Correct handling of floats test sensor list

[tockards]

This PR corrects the handling of floats in thesensor_tuple helper function used in test_sensor_list.

• This adds a new float sensor with a zero to the right of the decimal point
• Tests where the sensor is tested correctly inside test_sensor_list

[ajoubertza]

Looks good, except for the missing blank line.

[tockards]

@ajoubertza Thanks, this creeps in when I do my black format on a selected part of code and commit in a rush.

[tockards]

Need to add the linting option to tox so that a developer can do it locally.

[mmphego]

Looks good to me.

[bmerry]

I've started using pre-commit to define pre-commit hooks - it's a very nice Python wrapper around Git's hook system and it's saved me from making a lot of commits that would have failed flake8 or mypy.

[tockards]

thanks @bmerry . Going to give it a try.