make downline.appimage to type 2

[Lvaskz]

Hi, I am using appimagelauncher https://github.com/TheAssassin/Appimagelauncher, to integrate appimage to appmenu, but I have a problem, icon is missing from appmenu and task bar, after using it( not happen, if I don't use appimagelauncher). Appimagelauncher has a limited support for appimages type 1, like Downline , it suppose that appimagelauncher works better for appimage type 2. See TheAssassin/AppImageLauncher#3 and see this too: https://github.com/TheAssassin/AppImageLauncher/issues/117 This part especially : " Not normal, but there's not much we can do about it. Tell those people to use appimagetool and use a PNG for their icon (at least the one in the root directory, there may be others in usr/share/icons)."

I'm using Linuxmint 19.1 Cinnamon 4.0.9 64 bit thanks