Explicitly specifying the mainClass is no longer required

Incremental compilation supports enabled main class discovery

Author: smarter

README.md

@@ -30,7 +30,7 @@ that does not work with dotty, try to disable all plugins in
 ### Using Dotty in your own project
 
 1. [Use sbt 0.13.11 or newer](https://github.com/smarter/dotty-example-project/blob/master/project/build.properties).
-2. Configure your build like explained in [build.sbt](https://github.com/smarter/dotty-example-project/blob/master/build.sbt#L9-L10)
+2. Configure your build like explained in [build.sbt](https://github.com/smarter/dotty-example-project/blob/master/build.sbt#L7-L8)
 
 ### Discuss
 

build.sbt

@@ -3,8 +3,6 @@ lazy val root = (project in file(".")).
     name := "dotty-example-project",
     description := "Example sbt project that compiles using Dotty",
     version := "0.1",
-    mainClass in (Compile, run) := Some("Hello"),
-
 
     // All the settings set below this line are important to get your project
     // to compile with Dotty. Please read the comments carefully.