add CHANGELOG.md, fix int param in begin() (RobTillaart#17)

* add CHANGELOG.md, fix int param in begin()

update library.json, license, minor edits (RobTillaart#15)

add documentation (button) + getButtonMask() (RobTillaart#13)

* add documentation (button) + getButtonMask()

Develop (RobTillaart#11)

* fix RobTillaart#10 add get/setAddress()

Merge pull request RobTillaart#8 from RobTillaart/develop

fix for platformIO compatibility

Merge pull request RobTillaart#7 from RobTillaart/arduino-ci

* add Arduino-CI
* add unit test
* add examples
* update readme.md

Merge pull request RobTillaart#4 from RobTillaart/develop

fix RobTillaart#3 reverse + refactor + readme.md

Merge pull request RobTillaart#2 from RobTillaart/develop

fix read/write