Add -feature scalacOption and fix warnings

Author: lolgab

build.sbt

@@ -25,6 +25,9 @@ lazy val commonSettings = Seq(
   organization := "dev.whaling",
   version := "0.1.1-SNAPSHOT",
   scalaVersion := "2.11.12",
+  scalacOptions ++= Seq(
+    "-feature"
+  ),
   skip in publish := true,
   skip in publishLocal := true
 )

examples/timer/main.scala

@@ -6,12 +6,12 @@ object Main {
   implicit val ec:ExecutionContext = EventLoop
 
   def main(args:Array[String]):Unit = {
-    Timer.delay(3 seconds).flatMap { _ =>
+    Timer.delay(3.seconds).flatMap { _ =>
       println("beep")
-      Timer.delay(2 seconds)
+      Timer.delay(2.seconds)
     }.flatMap { _ =>
       println("boop")
-      Timer.delay(1 second)
+      Timer.delay(1.second)
     }.onComplete { _ =>
       println("done")
     }