Update license year (#58)

* Update license year

* Update LICENSE

Author: m1guelpf

LICENSE

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2017 David Åse
+   Copyright 2017-2018 David Åse
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.