Update LICENSE to reflect WebM authors

This code is Copyright The WebM Project Authors, not only Google.

Change-Id: Ib5a9dec4ba3177ccb2b06dcfe9605d2b3a3a3d8b

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2010, Google Inc. All rights reserved.
+Copyright (c) 2010, The WebM Project authors. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -12,9 +12,10 @@ met:
     the documentation and/or other materials provided with the
     distribution.
 
-  * Neither the name of Google nor the names of its contributors may
-    be used to endorse or promote products derived from this software
-    without specific prior written permission.
+  * Neither the name of Google, nor the WebM Project, nor the names
+    of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written
+    permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT