Merge pull request #212 from scala-steward/update/sbt-scalafix-0.9.15

Update sbt-scalafix to 0.9.15

Author: mergify[bot]

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.1.11")
-addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.14")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.15")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.3.4")
 addSbtPlugin("com.geirsson" % "sbt-ci-release" % "1.5.2")
 addSbtPlugin("com.47deg" % "sbt-microsites" % "1.1.5")