upgrade jackson to 2.9.9

Author: stevehu

pom.xml

@@ -61,7 +61,7 @@
         <java.version>1.6</java.version>
         <java.testversion>1.7</java.testversion>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <version.jackson>2.9.8</version.jackson>
+        <version.jackson>2.9.9</version.jackson>
         <version.slf4j>1.7.25</version.slf4j>
         <version.common-lang3>3.5</version.common-lang3>
         <version.logback>1.2.3</version.logback>