Include our copyright statement in license.txt

Chris Sanders · Chris Sanders · commit f913cf5296f9 · 2015-06-30T13:12:22.000-05:00
This is merely making the license file correct. This doesn't change our copyright or licensing whatsoever.
diff --git a/LICENSE.txt b/LICENSE.txt
@@ -1,5 +1,8 @@
 The MIT License (MIT)
 
+Copyright (c) SpongePowered <https://www.spongepowered.org>
+Copyright (c) contributors
+
 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
