update exemple version to 2.9.5 (FasterXML#2018)

https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-2.9.5

Author: based2

README.md

@@ -25,7 +25,7 @@ Functionality of this package is contained in Java package `com.fasterxml.jackso
 <properties>
   ...
   <!-- Use the latest version whenever possible. -->
-  <jackson.version>2.9.0</jackson.version>
+  <jackson.version>2.9.5</jackson.version>
   ...
 </properties>