Upgrade sbt plugins, remove unused scalastyle plugin

Author: smarter

project/plugins.sbt

@@ -3,10 +3,8 @@
 // e.g. addSbtPlugin("com.github.mpeltonen" % "sbt-idea" % "1.1.0")
 
 // Scala IDE project file generator
-addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "4.0.0")
+addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "5.1.0")
 
-addSbtPlugin("org.scalastyle" %% "scalastyle-sbt-plugin" % "0.8.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.14")
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.8")
-
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.3")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.4")