Adafruit-circuitpython-st7735r

This release includes:
* 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-st7735r`.

Read the [docs](http://circuitpython.readthedocs.io/projects/st7735r/en/latest/) for info on how to use it.

The examples now have the release_displays() function call in the proper location.

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

Read the [docs](https://circuitpython.readthedocs.io/projects/st7735r/en/latest/) for info on how to use it.

Examples for the rest of the displays have been updated in this release.

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

Read the [docs](https://circuitpython.readthedocs.io/projects/st7735r/en/latest/) for info on how to use it.

Removed a line of unused code from one of the examples.

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

Read the [docs](https://circuitpython.readthedocs.io/projects/st7735r/en/latest/) for info on how to use it.

The ST7735R library can now be inverted on initialization. Thanks Septolum.

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

Read the [docs](https://circuitpython.readthedocs.io/projects/st7735r/en/latest/) for info on how to use it.

Updated Readme to reflect differences with ST7735 library.

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

Read the [docs](https://circuitpython.readthedocs.io/projects/st7735r/en/latest/) for info on how to use it.