Migrate to sbt-assembly 13.0

Closes #4
diff --git a/build.sbt b/build.sbt
index 20cccdb..cdfd27d 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,7 +1,3 @@
-import AssemblyKeys._
-
-assemblySettings
-
 name := "template-scala-parallel-recommendation"
 
 organization := "org.apache.predictionio"
diff --git a/project/assembly.sbt b/project/assembly.sbt
index 54c3252..74adde3 100644
--- a/project/assembly.sbt
+++ b/project/assembly.sbt
@@ -1 +1 @@
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.11.2")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.13.0")