Enable MiMa for JS and increment prev version

Author: ashawley

build.sbt

@@ -25,6 +25,8 @@ lazy val xml = crossProject.in(file("."))
     scalacOptions         ++= "-deprecation:false -feature -Xlint:-stars-align,-nullary-unit,_".split("\\s+").to[Seq],
     scalacOptions in Test  += "-Xxml:coalescing",
 
+    mimaPreviousVersion := Some("1.1.0"),
+
     apiMappings ++= Map(
       scalaInstance.value.libraryJar
         -> url(s"http://www.scala-lang.org/api/${scalaVersion.value}/")
@@ -52,9 +54,6 @@ lazy val xml = crossProject.in(file("."))
   .jvmSettings(
     OsgiKeys.exportPackage := Seq(s"scala.xml.*;version=${version.value}"),
 
-    // there is currently no previous released JS version, therefore MiMa is enabled only on JVM
-    mimaPreviousVersion := Some("1.0.6"),
-
     libraryDependencies += "junit" % "junit" % "4.12" % "test",
     libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % "test",
     libraryDependencies += "org.apache.commons" % "commons-lang3" % "3.5" % "test",