Update version to 0.3.0

Author: DarkDimius

sbt-dotty/src/dotty/tools/sbtplugin/DottyPlugin.scala

@@ -14,10 +14,10 @@ object DottyPlugin extends AutoPlugin {
     // - if this was a settingKey, then this would evaluate even if you don't use it.
     def dottyLatestNightlyBuild: Option[String] = {
       println("Fetching latest Dotty nightly version (requires an internet connection)...")
-      val Version = """      <version>(0.2\..*-bin.*)</version>""".r
+      val Version = """      <version>(0.3\..*-bin.*)</version>""".r
       val latest = scala.io.Source
           .fromURL(
-            "http://repo1.maven.org/maven2/ch/epfl/lamp/dotty_0.2/maven-metadata.xml")
+            "http://repo1.maven.org/maven2/ch/epfl/lamp/dotty_0.3/maven-metadata.xml")
           .getLines()
           .collect { case Version(version) => version }
           .toSeq