Update sbt-assembly to 2.3.1

Author: scala-steward

project/plugins.sbt

@@ -6,7 +6,7 @@ addSbtPlugin("com.softwaremill.sbt-softwaremill" % "sbt-softwaremill-common" % s
 addSbtPlugin("com.softwaremill.sbt-softwaremill" % "sbt-softwaremill-publish" % sbtSoftwaremillVersion)
 addSbtPlugin("com.github.sbt" % "sbt-native-packager" % "1.11.0")
 addSbtPlugin("com.github.sbt" % "sbt-git" % "2.1.0")
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.0")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.1")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.3.0")
 
 libraryDependencies += "com.amazonaws" % "aws-java-sdk-s3" % "1.11.601"