Update README.md

Author: amirhnajafiz

README.md

@@ -9,21 +9,22 @@ Fast library for scanning ports of a host
 ## How to use?
 You need to give a host address and port range, after that the scanner will 
 check the ports and returns the open ports.
+
 ```go
 package main
 
 import (
-	"fmt"
+    "fmt"
 
-	scanner "github.com/amirhnajafiz/port-scanner"
+    scanner "github.com/amirhnajafiz/port-scanner"
 )
 
 func main() {
     // creating scanner with URI, Port Range, Number of workers (optional, default is 100)
-	openports := scanner.Scan("", 2048)
+    openports := scanner.Scan("", 2048)
 
-	for _, port := range openports {
-		fmt.Printf("%d open\n", port)
-	}
+    for _, port := range openports {
+        fmt.Printf("%d open\n", port)
+    }
 }
 ```