include pid in sleep response

gracedemo/demo.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"github.com/daaku/go.grace/gracehttp"
 	"net/http"
+	"os"
 	"time"
 )
 
@@ -36,10 +37,11 @@ func newHandler(name string) http.Handler {
 		time.Sleep(duration)
 		fmt.Fprintf(
 			w,
-			"%s started at %s slept for %d nanoseconds.\n",
+			"%s started at %s slept for %d nanoseconds from pid %d.\n",
 			name,
 			now,
 			duration.Nanoseconds(),
+			os.Getpid(),
 		)
 	})
 	return mux