Adafruit-circuitpython-mcp3xxx

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-mcp3xxx`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mcp3xxx/en/latest/) for info on how to use it.

This release includes:
* Support for the MCP3002 ADC has been added.
* Migrating this repository from Travis to GitHub Actions. This has no effect on the behavior of the code itself.

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

To use in CPython, `pip3 install adafruit-circuitpython-mcp3xxx`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mcp3xxx/en/latest/) for info on how to use it.

* https://github.com/adafruit/Adafruit_CircuitPython_MCP3xxx/pull/20 Added MCP3002 support, updated documentation. Thanks 2bndy5!
* API/Documentation improvements: more concise differential channel mappings, links to datasheets for wiring/pinout, warning for negative numbers. Thanks 2bndy5!

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

To use in CPython, `pip install adafruit-circuitpython-mcp3xxx`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mcp3xxx/en/latest/) for info on how to use it.

* Renamed examples to match library name, updated documentation. Thanks magnusvmt!

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

To use in CPython, `pip install adafruit-circuitpython-mcp3xxx`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mcp3xxx/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, `pip install adafruit-circuitpython-mcp3xxx`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mcp3xxx/en/latest/) for info on how to use it.

* 11 - Fix to calculate differential value on pin 7 correctly for the MCP3004 and MCP3008 - yoomy3
* Added more verbose docstrings to show the differential channel mapping for the MCP3004 and MCP3008 - yoomy3

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip install adafruit-circuitpython-mcp3xxx`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mcp3xxx/en/latest/) for info on how to use it.