Release 1.3.0

Improved behavior when deleting a node.

Release 1.2

Prepared to be listed in Arduino and PlatformIO.org Library Manager.

Release 1.1.0

Made the structure flat so it matches PlatformIO library component expectations.

Minimal viable product version for Arduino

Merge pull request #3 from dniklaus/master

Merge pull request #1 from ERNICommunity/master