Update license years in the Acknowledgements file

Author: mattrubin

Authenticator/Resources/Acknowledgements.html

@@ -33,7 +33,7 @@ <h2><a href="https://github.com/ekscrypto/Base32">
     <h2><a href="https://github.com/mattrubin/OneTimePassword">
         OneTimePassword
     </a></h2>
-    <p>Copyright (c) 2013-2016 Matt Rubin and the OneTimePassword authors</p>
+    <p>Copyright (c) 2013-2017 Matt Rubin and the OneTimePassword authors</p>
     <p>Permission is hereby granted, free of charge, to any person obtaining a copy
     of this software and associated documentation files (the "Software"), to deal
     in the Software without restriction, including without limitation the rights