No need to have a separate plugin directory

Author: richardimaoka

build.sbt

@@ -2,10 +2,6 @@ scalaVersion := "2.12.4"
 
 lazy val root = project
   .in(file("."))
-  .aggregate(unidocPlugin)
-
-lazy val unidocPlugin = project
-  .in(file("plugin"))
   .settings(
     sbtPlugin := true,
     organization := "com.lightbend.akka",

plugin/src/main/scala/com/lightbend/paradox/unidoc/UnidocPlugin.scala renamed to src/main/scala/com/lightbend/paradox/unidoc/UnidocPlugin.scala

@@ -9,9 +9,9 @@ import sbt._
 
 object UnidocPlugin extends AutoPlugin {
 
-  override def requires = ParadoxPlugin
+  override def requires: Plugins = ParadoxPlugin
 
-  override def trigger = noTrigger
+  override def trigger: PluginTrigger = noTrigger
 
   override def projectSettings: Seq[Setting[_]] = unidocSettings(Compile)