Update license again

Added back copyright statements from latent diffusion and stable diffusion repos.

Author: lstein

LICENSE

@@ -2,6 +2,17 @@ MIT License
 
 Copyright (c) 2022 Lincoln Stein and InvokeAI Organization
 
+This software is derived from a fork of the source code available from
+https://github.com/pesser/stable-diffusion and
+https://github.com/CompViz/stable-diffusion. They carry the following
+copyrights:
+
+Copyright (c) 2022 Machine Vision and Learning Group, LMU Munich
+Copyright (c) 2022 Robin Rombach and Patrick Esser and contributors
+
+Please see individual source code files for copyright and authorship
+attributions.
+
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights