Update Scala versions

Author: stringbean

build.sbt

@@ -4,8 +4,8 @@ import com.typesafe.sbt.SbtGit.GitKeys._
 organization := "software.purpledragon.xml"
 version := "1.0.3-SNAPSHOT"
 
-scalaVersion := "2.12.8"
-crossScalaVersions := Seq(scalaVersion.value, "2.11.12", "2.13.0")
+scalaVersion := "2.13.1"
+crossScalaVersions := Seq(scalaVersion.value, "2.11.12", "2.12.10")
 
 // dependencies common for all sub-projects
 libraryDependencies ++= Seq(