Add postcss-custom-properties attribution

MadLittleMods · MadLittleMods · commit e4c1a0ddc2e3 · 2015-05-06T21:26:46.000-05:00
diff --git a/LICENSE b/LICENSE
@@ -2,6 +2,8 @@ The MIT License (MIT)
 
 Copyright 2015 Eric Eastwood <contact@ericeastwood.com>
 
+This software includes some test fixtures from postcss-custom-properties: Copyright (c) 2014 Maxime Thirouin, Nicolas Gallagher & TJ Holowaychuk
+
 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 to
