Update sbt-scalafix to 0.14.0 (#429)

Author: hnaderi

project/plugins.sbt

@@ -1,7 +1,7 @@
 addSbtPlugin("com.github.sbt" % "sbt-unidoc" % "0.5.0")
 addSbtPlugin("org.scalastyle" %% "scalastyle-sbt-plugin" % "1.0.0")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")
-addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.13.0")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.14.0")
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.10.0")
 addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.7.5")
 addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.7.5")