remove unused exectutor

src/main/kotlin/Main.kt

@@ -6,7 +6,6 @@ import java.net.InetSocketAddress
 fun main(args: Array<String>) {
     val server = HttpServer.create(InetSocketAddress(8000), 0)
     server.createContext("/", MyHandler())
-    server.executor = null // creates a default executor
     server.start()
     println("Server listing on port 8000")
 }