Update sbt-scoverage to 2.3.1 (chitralverma#156)

Author: scala-steward

project/plugins.sbt

@@ -4,7 +4,7 @@ addSbtPlugin("com.github.sbt" % "sbt-java-formatter" % "0.10.0")
 
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.4")
 
-addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.2.2")
+addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.3.1")
 
 addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.6.4")