Set previous version to 3.0.2 and next ro 3.1.1-RC1

Author: Kordyjan

project/Build.scala

@@ -65,7 +65,7 @@ object DottyJSPlugin extends AutoPlugin {
 object Build {
   val referenceVersion = "3.1.0-RC1-bin-20210823-dd7a07a-NIGHTLY"
 
-  val baseVersion = "3.1.0-RC1"
+  val baseVersion = "3.1.1-RC1"
 
   // Versions used by the vscode extension to create a new project
   // This should be the latest published releases.
@@ -81,7 +81,7 @@ object Build {
    *  set to 3.1.3. If it is going to be 3.1.0, it must be set to the latest
    *  3.0.x release.
    */
-  val previousDottyVersion = "3.0.1"
+  val previousDottyVersion = "3.0.2"
 
   object CompatMode {
     final val BinaryCompatible = 0