Circuitpython-mcp48xx

What's Changed
* Refactor library code and improve docs by brushmate in https://github.com/brushmate/CircuitPython_MCP48XX/pull/2

**Full Changelog**: https://github.com/brushmate/CircuitPython_MCP48XX/compare/1.0.0...1.0.1

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

To use in CPython, `pip install circuitpython-mcp48xx`.

Read the [docs](https://circuitpython-mcp48xx.readthedocs.io/en/latest/) for info on how to use it.

First release of the MCP48XX module for CircuitPython which adds support for the Microchip MCP4801, MCP4811, MCP4821, MCP4802, MCP4812, and MCP4822 digital to analog converters.

This release includes

* setting a channel's value
* setting a channel's gain
* setting a channel's shutdown mode

To use in CircuitPython, download the .mpy file and copy it to the `lib` folder on the `CIRCUITPY` drive.

To use in CPython, `pip install circuitpython-mcp48xx`.

Read the [docs](https://circuitpython-mcp48xx.readthedocs.io/en/latest/) for info on how to use it.

First release candidate of the MCP48XX module for CircuitPython which adds support for the Microchip MCP4801, MCP4811, MCP4821, MCP4802, MCP4812, and MCP4822 digital to analog converters.

This release includes

* setting a channel's value
* setting a channel's gain
* setting a channel's shutdown mode

Read the [docs](https://circuitpython-mcp48xx.readthedocs.io/en/latest/) for info on how to use it.