Merge pull request #15 from kiambogo/fixReadme

Update Readme to reflect fs2 1.0.0 changes

Author: SystemFw

README.md

@@ -94,15 +94,13 @@ you can then do:
 
 ``` scala
 import upperbound._, syntax.rate._
-import fs2.StreamApp
-import fs2.StreamApp.ExitCode
 import fs2.Stream
-import cats.effect.IO
+import cats.effect.{IO, IOApp, ExitCode}
 import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent.duration._
 
-object Main extends StreamApp[IO] {
-  override def stream(args: List[String], requestShutdown: IO[Unit]) : Stream[IO, ExitCode] =
+object Main extends IOApp {
+  override def run(args: List[String]): IO[ExitCode] =
     for {
       limiter <- Limiter.stream[IO](100 every 1.minute)
       res <- Stream.eval(YourWholeProgram(limiter.worker).doStuff).as(ExitCode.Success)