Fix license in appstream
Context
flatpak info org.freedekstop.Sdk//18.08
20:25 <alatiera> the license is wrong though
20:25 <alatiera> its MIT/X11 iirc, not gpl
20:25 <nanonyme> I didn't change that from original
20:26 <nanonyme> So it was probably wrong to begin with
Description
Let's make license correct in all supported branches.
Acceptance Criteria
License is correct.
Edited by Jordan Petridis