Merge pull request #19 from typelevel/update/sbt-typelevel-0.4.16

Update sbt-typelevel, sbt-typelevel-site to 0.4.16

Author: armanbilge

project/plugins.sbt

@@ -1,3 +1,3 @@
-addSbtPlugin("org.typelevel" % "sbt-typelevel"      % "0.4.15")
-addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.4.15")
+addSbtPlugin("org.typelevel" % "sbt-typelevel"      % "0.4.16")
+addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.4.16")
 addSbtPlugin("org.scala-js"  % "sbt-scalajs"        % "1.10.1")