update MiMa config (#183)

Author: SethTisue

build.sbt

@@ -22,10 +22,7 @@ lazy val core = project.in(file("core"))
   .settings(
     name := "scala-parallel-collections",
     Compile / doc / autoAPIMappings := true,
-    scalaModuleMimaPreviousVersion := (CrossVersion.partialVersion(scalaVersion.value) match {
-      case Some((3, _)) => None
-      case _            => Some("1.0.0")
-    }),
+    scalaModuleMimaPreviousVersion := Some("1.0.3"),
   )
 
 lazy val junit = project.in(file("junit"))

project/plugins.sbt

@@ -1,2 +1,2 @@
 addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "2.3.0")
-addSbtPlugin("ch.epfl.scala" % "sbt-version-policy" % "1.0.0")
+addSbtPlugin("ch.epfl.scala" % "sbt-version-policy" % "1.0.1")