Setting icon to a single path doesn't show the icon

[malept]

What version of electron-installer-flatpak are you using? 0.11.4

What operating system are you using? Ubuntu Linux 18.04

Can you compile the example app successfully?

Yes

What did you do? Please include the configuration you are using for electron-installer-flatpak.

Set icon to icon.png which exists

What did you expect to happen?

When I look in GNOME's activities, my app has an icon

What actually happened?

my app doesn't have an icon

Extra information

When building:

@malept/flatpak-bundler Exporting /tmp/flatpak-bundler-26868-OM8v9WEkHzIw/build/files/share/pixmaps/io.atom
.electron.demo123.png to /tmp/flatpak-bundler-26868-OM8v9WEkHzIw/build/export/share/pixmaps/io.atom.electron.
demo123.png +77ms
[...]
  @malept/flatpak-bundler 1> WARNING: Icon referenced in desktop file but not exported: io.atom.electron.demo
123

When installing:

Warning: Not exporting file io.atom.electron.demo123.png of unsupported type.

Workaround

Set icon to an object, with the appropriate size. For example, with a 48x48 icon:

{
  icon: {
    "48x48": "icon.png"
  }
}

[openspeedtest]

Awesome! Thanks