Mark release version 0.3.1

Author: jpsacha

build.sbt

@@ -11,7 +11,7 @@ import scala.xml.{Node => XmlNode, NodeSeq => XmlNodeSeq, _}
 // JAR_BUILT_BY      - Name to be added to Jar metadata field "Built-By" (defaults to System.getProperty("user.name")
 //
 
-val projectVersion = "0.3.1-SNAPSHOT"
+val projectVersion = "0.3.1"
 val versionTagDir  = if (projectVersion.endsWith("SNAPSHOT")) "master" else "v" + projectVersion
 val _scalaVersions = Seq("2.13.0", "2.12.9")
 val _scalaVersion = _scalaVersions.head