Feature request: Add icon for menu and dock bar ubuntu 18.04 using appimagelauncher

[Lvaskz]

Hi, I am using appimagelauncher to integrate appimages to ap menu, see here: https://github.com/TheAssassin/AppImageLauncher
The problem is appmenu and docker icon is missing, when I integrate it, the same thing happens with synfig develop version.
If you can update to appimage type 2 and make it compatible with appimagelauncher you can get rid the instalatión script