fix: add funding information

fix: Reduce npm package size

feat: Fix for Editor.js v2.19.1 (#24)

BREAKING CHANGE: For avoiding default exports, the module export method is also changed. 

* Simplify demo

* Avoid default exports

* Fix for v2.19.1

* Fix README

feat: remove WIP

feat: release

fix: strict sanitize

fix: use custom eiement instead of span

BREAKING CHANGE: The OutputData of older version has not been supported.

perf: use custom element instead of span

fix: prevent Editor.js keydown event

fix: prevent creating empty editorjs-style span