v2.1.0 FEATURES

New Features:

#181 - feat: Add events @opened and @closed
#182 - feat(event): add item-changed event
#183 - docs(js): add code level docs. Should make it easier to contribute now.
#184 - feat(css): configurable prefix

Issues closed:
Fixes #97, #150, #177, #178

Thanks to @BerniML for the opened/closed PR and for becoming the latest contributor!