[S2GRAPH-120] Netty version is conflict with play 2.5.9.

JIRA:
    [S2GRAPH-120] https://issues.apache.org/jira/browse/S2GRAPH-120

Pull Request:
    Closes #90

Authors
    DO YUNG YOON: steamshon@apache.org
diff --git a/CHANGES b/CHANGES
index 8740c59..945e464 100644
--- a/CHANGES
+++ b/CHANGES
@@ -111,6 +111,8 @@
     S2GRAPH-64: incrementCounts yield type case exception (Committed by DOYUNG YOON).
   
     S2GRAPH-118: Fix compile error on test cases on loader project (Committed by DOYUNG YOON).
+    
+    S2GRAPH-120: Netty version is conflict with play 2.5.9 (Committed by DOYUNG YOON).
 
   TASKS
 
diff --git a/s2rest_play/build.sbt b/s2rest_play/build.sbt
index 7583ad9..bab13cd 100644
--- a/s2rest_play/build.sbt
+++ b/s2rest_play/build.sbt
@@ -23,7 +23,8 @@
 scalacOptions in Test ++= Seq("-Yrangepos")
 
 libraryDependencies := (libraryDependencies.value ++ Seq(ws, filters, specs2 % Test)).map(_.excludeLogging()) ++ Seq(
-  "com.google.guava" % "guava" % "12.0.1" force() // use this old version of guava to avoid incompatibility
+  "com.google.guava" % "guava" % "12.0.1" force(), // use this old version of guava to avoid incompatibility
+  "io.netty" % "netty-all" % "4.0.40.Final" force()
   //"org.specs2" %% "specs2-core" % specs2Version % "test"
 )