sbt 0.13.X should be using sbt-assembly 0.11.X

https://github.com/sbt/sbt-assembly/blob/master/README.md

Author: Kalpit Shah <shahkalpit84@gmail.com>

Closes #555 from kalpit/upgrade/sbtassembly and squashes the following commits:

1fa7324 [Kalpit Shah] sbt 0.13.X should be using sbt-assembly 0.11.X

project/plugins.sbt

@@ -4,7 +4,7 @@ resolvers += Resolver.url("artifactory", url("http://scalasbt.artifactoryonline.
 
 resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/"
 
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.10.2")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.11.2")
 
 addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.2.0")