Updated year in copyright.

Mostly done with mvn license:format.

No functional changes.
CountryController: removed useless throws clause.

Should be in cc0a7b3bb9760d7d2158fab8bf00fd22757ea438 commit.

No functional changes.
SeriesController: removed useless throws clause.

Should be in 1bb56b927dafda1be4d913d7201043e850e77e2a commit.

No functional changes.