fix license format

RyanTM (Pololu) · RyanTM (Pololu) · commit 06777651d795 · 2020-12-17T12:51:51.000-08:00
diff --git a/LICENSE.txt b/LICENSE.txt
@@ -1,7 +1,4 @@
-Copyright (c) 2019 Pololu Corporation.  For more information, see
-
-http://www.pololu.com/
-http://forum.pololu.com/
+Copyright (c) 2019-2020 Pololu Corporation (www.pololu.com)
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation
