Merge pull request #379 from scala-steward/update/sbt-scalafmt-2.5.5

Update sbt-scalafmt to 2.5.5

Author: dos65

project/plugins.sbt

@@ -1,3 +1,3 @@
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.7")
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.4")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.5")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.2")