Update sbt-scalafmt to 2.4.2 (#102)

Author: dmp-team

project/plugins.sbt

@@ -1,7 +1,7 @@
 lazy val root: Project     = project.in(file(".")).dependsOn(latestSbtUmbrella)
 lazy val latestSbtUmbrella = ProjectRef(uri("git://github.com/kamon-io/kamon-sbt-umbrella.git#kamon-2.x"), "kamon-sbt-umbrella")
 
-addSbtPlugin("org.scalameta"             % "sbt-scalafmt"    % "2.4.0")
+addSbtPlugin("org.scalameta"             % "sbt-scalafmt"    % "2.4.2")
 addSbtPlugin("com.dwijnand"              % "sbt-dynver"      % "4.1.1")
 addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat"    % "0.1.14")
 addSbtPlugin("com.typesafe"              % "sbt-mima-plugin" % "0.8.1")