Bump up jackson dependency to 2.8.8

Change-Id: If9498ec17504dc0278a17d5f0dd5d89e756ee087
diff --git a/lib/pom.xml b/lib/pom.xml
index 0079be7..41c5145 100644
--- a/lib/pom.xml
+++ b/lib/pom.xml
@@ -44,7 +44,7 @@
         <karaf.version>3.0.8</karaf.version>
         <jersey.version>2.25.1</jersey.version>
         <jetty.version>9.2.21.v20170120</jetty.version>
-        <jackson.version>2.8.6</jackson.version>
+        <jackson.version>2.8.8</jackson.version>
         <slf4j.version>1.7.21</slf4j.version>
         <guava.version>21.0</guava.version>
         <commons.io.version>2.4</commons.io.version>