Bump the copyright years

Author: bbatsov

README.md

@@ -59,7 +59,7 @@ PEG parser generator library.
 
 ## License
 
-© 2017-2018 Arne Brasseur
+© 2017-2019 Arne Brasseur
 
 Distributed under the terms of the GNU General Public License 3.0 or later. See
 [LICENSE](LICENSE).