Update to netty-3.9.8.Final.

http://netty.io/news/2015/05/08/3-9-8-Final-and-3.html

pom.xml

@@ -278,7 +278,7 @@
             <dependency>
                 <groupId>io.netty</groupId>
                 <artifactId>netty</artifactId>
-                <version>3.9.6.Final</version>
+                <version>3.9.8.Final</version>
             </dependency>
             <dependency>
                 <groupId>com.jayway.jsonpath</groupId>