fix header for d3-sankey.js

antoinerg · antoinerg · commit 2504dc3b6910 · 2018-12-12T17:59:57.000-05:00
diff --git a/src/traces/sankey/d3-sankey.js b/src/traces/sankey/d3-sankey.js
@@ -1,3 +1,11 @@
+/**
+* Copyright 2012-2018, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
 /**
 Copyright 2015, Mike Bostock
 All rights reserved.
