Release Dotty 0.27.0-RC1

Author: anatoliykmetyuk

project/Build.scala

@@ -55,7 +55,7 @@ object MyScalaJSPlugin extends AutoPlugin {
 object Build {
   val referenceVersion = "0.27.0-bin-20200819-6e6f67b-NIGHTLY"
 
-  val baseVersion = "0.28.0"
+  val baseVersion = "0.27.0-RC1"
   val baseSbtDottyVersion = "0.4.2"
 
   // Versions used by the vscode extension to create a new project