Merge pull request scala#85 from dotty-staging/scala3-release-3.0.0

Upgrade Dotty to 3.0.0

Author: xuwei-k

README.md

@@ -40,7 +40,7 @@ You must use sbt 1.5.0 or newer; older versions of sbt are not supported.
 Set up the Scala 3 version:
 
 ```scala
-scalaVersion := "3.0.0-RC3"
+scalaVersion := "3.0.0"
 ```
 
 ### Getting your project to compile with Scala 3

build.sbt

@@ -4,5 +4,5 @@ lazy val root = project
     name := "scala3-example-project",
     description := "Example sbt project that compiles using Scala 3",
     version := "0.1.0",
-    scalaVersion := "3.0.0-RC3"
+    scalaVersion := "3.0.0"
   )