Merge pull request #14 from typelevel/update/sbt-typelevel-0.4.13

Update sbt-typelevel, sbt-typelevel-site to 0.4.13

Author: rossabaker

project/plugins.sbt

@@ -1,5 +1,5 @@
-addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.4.12")
-addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.4.12")
+addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.4.13")
+addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.4.13")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.10.1")
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.5")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.2.0")