版本：0.2.2
- https://cdn.bootcdn.net/ajax/libs/pell/0.2.2/pell.css
- https://cdn.bootcdn.net/ajax/libs/pell/0.2.2/pell.js
- https://cdn.bootcdn.net/ajax/libs/pell/0.2.2/pell.min.css
- https://cdn.bootcdn.net/ajax/libs/pell/0.2.2/pell.min.js
pell - the simplest and smallest WYSIWYG text editor for web, with no dependencies