update sbt and versions (#6)

Author: infomofo

build.sbt

@@ -1,14 +1,15 @@
 import Dependencies._
 
-ThisBuild / scalaVersion     := "2.12.10"
-ThisBuild / version          := "0.1.0-SNAPSHOT"
-ThisBuild / organization     := "com.example"
-ThisBuild / organizationName := "example"
+ThisBuild / scalaVersion     := "2.13.2"
+ThisBuild / version          := "0.4.0"
+ThisBuild / organization     := "com.infomofo"
+ThisBuild / organizationName := "infomofo"
+ThisBuild / crossScalaVersions := Seq("2.11.12", "2.12.11")
 
 lazy val root = (project in file("."))
   .settings(
     name := "scala-ssml",
-    libraryDependencies += "org.scala-lang.modules" %% "scala-xml" % "1.1.0",
+    libraryDependencies += "org.scala-lang.modules" %% "scala-xml" % "1.3.0",
     libraryDependencies += scalaTest % Test
   )