Headings 4 to 6 Joplin Plugin

This Joplin plugin Adds menu items, keyboard shortcuts and toolbar buttons to the WYSIWIG editor toolbar to apply headings level 4 to 6.

Note : when opening Joplin, if the rich text editor is open, the toolbar will not show the new buttons. You must switch to another note first.

For information on how to build or publish the plugin, please see GENERATOR_DOC.md