Adafruit-circuitpython-lis3mdl

We have upgraded Pylint checks to use the latest version of Pylint and implemented usage of Black Python formatting. This does not change the functionality of the code - it is designed to bring it up to current standards and make it more readable.

* Remove pinned Pylint version number from build.yml file
* Synced `.pylintrc` file to match Adafruit standard
* Ran upgraded Pylint and applied any changes or new disables necessary
* Ran Black formatter and allowed application of changes across entire repo

For more information on using Pylint and Black on your code, check out [this guide on working with Pylint and Black](https://learn.adafruit.com/improve-your-code-with-pylint)

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-lis3mdl`.

Read the [docs](http://circuitpython.readthedocs.io/projects/lis3mdl/en/latest/) for info on how to use it.

Added compass example. Thanks FoamyGuy

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-lis3mdl`.

Read the [docs](http://circuitpython.readthedocs.io/projects/lis3mdl/en/latest/) for info on how to use it.

This release includes a fix to output the `magnetic` readings in the proper microTeslas (uT)

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-lis3mdl`.

Read the [docs](http://circuitpython.readthedocs.io/projects/lis3mdl/en/latest/) for info on how to use it.

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-lis3mdl`.

Read the [docs](http://circuitpython.readthedocs.io/projects/lis3mdl/en/latest/) for info on how to use it.

This release includes
* `magnetic` property to take x,y,z readings in milliTeslas
* properties for `performance_mode`, `operation_mode`, `data_rate`, and `range`

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-lis3mdl`.

Read the [docs](http://circuitpython.readthedocs.io/projects/lis3mdl/en/latest/) for info on how to use it.