Merge pull request #158 from dispatch/ahc-1.9.40

Bump AHC version to 1.9.40.

Author: farmdawgnation

core/build.sbt

@@ -4,7 +4,7 @@ description :=
   "Core Dispatch module wrapping sonatype/async-http-client"
 
 libraryDependencies +=
-  "com.ning" % "async-http-client" % "1.9.11"
+  "com.ning" % "async-http-client" % "1.9.40"
 
 Seq(lsSettings :_*)