Changes required to conform to jEdit 4.4 API:

# Even if you don't store additional files, this is a good idea to set so you get 0 instead of unknown:
plugin.QuickNotepadPlugin.usePluginHome=true

# Added a .description property. this is the "short description":
plugin.QuickNotepadPlugin.description=This plugin provides a dockable "scratch pad" for writing and displaying notes, to do lists or similar items as unformatted text.

Provided a long description in an accompanying file "description.html"