message: s/toggle-button/checkbox/g in licences.txt
diff: @@ -1973,7 +1973,7 @@ The following software may be included in this product: paper-toast. A copy of t
  -----
  -The following software may be included in this product: paper-toggle-button. A copy of the source code may be downloaded from https://github.com/PolymerElements/paper-toggle-button. This software contains the following license and notice below:
  +The following software may be included in this product: paper-checkbox. A copy of the source code may be downloaded from https://github.com/PolymerElements/paper-checkbox. This software contains the following license and notice below:
  // Copyright (c) 2014 The Polymer Authors. All rights reserved.
  //
  