Upgrade Jackson version

Author: garyrussell

build.gradle

@@ -119,7 +119,7 @@ subprojects { subproject ->
 		hibernateVersion = '5.2.10.Final'
 		hsqldbVersion = '2.4.0'
 		h2Version = '1.4.197'
-		jackson2Version = '2.9.4'
+		jackson2Version = '2.9.8'
 		javaxActivationVersion = '1.1.1'
 		javaxMailVersion = '1.6.1'
 		jmsApiVersion = '2.0.1'