Update copyright clause.

LICENSE

@@ -1,5 +1,5 @@
 Copyright (C) 2011-2014 Nicolas Petton <petton.nicolas@gmail.com>
-Copyright (C) 2011-2016 Amber contributors [CONTRIBUTORS]
+Copyright (C) 2011-2017 Amber contributors [CONTRIBUTORS]
 
 Parts of Amber take ideas from Clamato (http://clamato.net), written by Avi Bryant.
 

external/amber-cli/LICENSE

@@ -1,5 +1,5 @@
 Copyright (C) 2011-2014 Nicolas Petton <petton.nicolas@gmail.com>
-Copyright (C) 2011-2016 Amber contributors [CONTRIBUTORS]
+Copyright (C) 2011-2017 Amber contributors [CONTRIBUTORS]
 
 Parts of Amber take ideas from Clamato (http://clamato.net), written by Avi Bryant.