Merge pull request #88 from mio-19/patch-2

make the code in BasicUsage.rst to compile

docs/BasicUsage.rst

@@ -97,6 +97,7 @@ The minimal complete snippet looks as follows:
 
     package com.example.myModule
 
+    import scala.concurrent.duration.DurationInt
     import scala.concurrent.{Await, Future}
     import scala.concurrent.ExecutionContext.Implicits.global
     import scala.concurrent.duration.Duration
@@ -115,7 +116,7 @@ The minimal complete snippet looks as follows:
       }
 
       def main(args: Array[String]): Unit =
-        val f = Await.ready(greet(), Duration(1.seconds))
+        val f = Await.ready(greet(), 1.seconds)
         f.failed.map { ex => println(ex.getMessage) }