Update sbt-scalafmt to 2.5.4

Author: robinraju

project/plugins.sbt

@@ -3,7 +3,7 @@
 addSbtPlugin("io.spray" % "sbt-revolver" % "0.10.0")
 
 // scalafmt -  Format source files
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.4")
 
 // scalafix - Rules for code format: organize imports
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.13.0")