Fix compile problem when Jackson 2 is not on classpath
Fix compile problem when Jackson 2 is not on classpath

Dependency jackson-annotations can't be optional, but it contains
just few annotations, so it's not a problem.

jameBoy/spring-rest-exception-handler,lokinell/spring-rest-exception-handler,jirutka/spring-rest-exception-handler,polarBearGit/spring-rest-exception-handler,jirutka/spring-rest-exception-handler,merikan/spring-rest-exception-handler,veiset/spring-rest-exception-handler