v0.1.3 bugfix

Fix issue #3 - 'naive' I2C transaction in pimoroniTrackball::changed() caused it to fail on ESP32 and maybe other targets
Fix compiler warnings for use of TwoWire.requestFrom(int, int, int)
Fix some style issues and tidy up
Tested on ESP32-S2, ESP8266 and ATmega32u4

v0.1.2 bugfix

Fixes #2, which caused crashes that weren't caught due to testing exclusively on AVR

Minor bugfix in click/release

Thanks to pricorde for pointing out a silly bug. It worked despite the bug but may as well fix it.

First working release

Lacking interrupt and callback support but works fine when using regular polling to read the trackball.