adjust version policy for 1.2.0 release

Author: SethTisue

build.sbt

@@ -14,7 +14,7 @@ publish / skip := true // in root
 lazy val commonSettings: Seq[Setting[_]] =
   Seq(scalaModuleAutomaticModuleName := Some("scala.collection.parallel")) ++
   ScalaModulePlugin.scalaModuleSettings ++ Seq(
-    versionPolicyIntention := Compatibility.BinaryAndSourceCompatible,
+    versionPolicyIntention := Compatibility.BinaryCompatible,
     crossScalaVersions := scalaVersions,
     Compile / compile / scalacOptions --= (CrossVersion.partialVersion(scalaVersion.value) match {
       case Some((3, _)) => Seq("-Xlint")