Enforcing java-6 for now

Author: muuki88

build.sbt

@@ -17,7 +17,7 @@ name := "sbt-native-packager"
 
 organization := "com.typesafe.sbt"
 
-scalacOptions in Compile += "-deprecation"
+scalacOptions in Compile ++= Seq("-deprecation", "-target:jvm-1.6")
 
 libraryDependencies ++= Seq(
     "org.apache.commons" % "commons-compress" % "1.4.1",