Publish v2.3.3

Merge pull request 7PH#16 from 7PH/dev/pulse

Implement pulse effect

Update README.md

2.1.0

Merge pull request 7PH#8 from 7PH/dev/7ph

Jest testing coverage, manual play mode, documentation update

Publish v1.2.0 & Upgrade dev dependencies to latest

Publish v1.1.0

Publish first official release 1.0.0