updated example to use range

Author: matryer

progress.go

@@ -10,16 +10,10 @@
 //  go func() {
 //      ctx := context.Background()
 //      progressChan := progress.NewTicker(ctx, r, size, 1*time.Second)
-//      for {
-//          select {
-//          case progress, ok := <-progressChan:
-//              if !ok {
-//                  fmt.Println("\rdownload is completed")
-//                  return
-//              }
-//              fmt.Printf("\r%v remaining...", progress.Remaining().Round(time.Second))
-//          }
+//      for p := range progressChan {
+//      	fmt.Printf("\r%v remaining...", p.Remaining().Round(time.Second))
 //      }
+//      fmt.Println("\rdownload is completed")
 //  }()
 //
 //  // use the Reader as normal