Adafruit-circuitpython-mpr121

* Update for removal of `stop` kwarg. ([more info](https://github.com/adafruit/circuitpython/issues/2082))

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

To use in CPython, `pip3 install adafruit-circuitpython-mpr121`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mpr121/en/latest/) for info on how to use it.

Updated Examples are Adabot approved. Thanks dherrada

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

To use in CPython, `pip3 install adafruit-circuitpython-mpr121`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mpr121/en/latest/) for info on how to use it.

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

To use in CPython, `pip3 install adafruit-circuitpython-mpr121`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mpr121/en/latest/) for info on how to use it.

* Replaces `set_thresholds()` with individual `threshold` and `release_threshold` properties which can be queried and set for each touch channel.

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

To use in CPython, `pip3 install adafruit-circuitpython-mpr121`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mpr121/en/latest/) for info on how to use it.

Updated example to match lib recent update.

Updated `_write_register_byte` for I2C usage.

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

To use in CPython, `pip3 install adafruit-circuitpython-mpr121`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mpr121/en/latest/) for info on how to use it.

* Current state of individual pins can be accessed using array index and properties `value` and `raw_value`, ex: `mpr121[0].value`.
* Adds `.touched_pins()` to get current state of all pins with one call.

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-mpr121`.

Read the [docs](http://circuitpython.readthedocs.io/projects/mpr121/en/latest/) for info on how to use it.