Merge pull request #230 from scala-steward/update/sbt-microsites-1.3.4

Update sbt-microsites to 1.3.4

Author: rossabaker

project/plugins.sbt

@@ -1,4 +1,4 @@
-addSbtPlugin("com.47deg" % "sbt-microsites" % "1.3.3")
+addSbtPlugin("com.47deg" % "sbt-microsites" % "1.3.4")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.0.0")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.5.1")
 addSbtPlugin("com.codecommit" % "sbt-spiewak-sonatype" % "0.20.4")