Update version number in sbt-dotty for 2.12.x compat

Author: felixmulder

project/Build.scala

@@ -876,7 +876,7 @@ object Build {
 
 
       sbtPlugin := true,
-      version := "0.1.4",
+      version := "0.1.5",
       ScriptedPlugin.scriptedSettings,
       ScriptedPlugin.sbtTestDirectory := baseDirectory.value / "sbt-test",
       ScriptedPlugin.scriptedBufferLog := false,