Add Stop() documentation

Author: leozz37

README.md

@@ -144,6 +144,7 @@ type Listener struct {
     SocketListener net.Listener
     HasNewMessages func() bool
     GetMessage     func() string
+    Stop           func()
 }
 ```
 
@@ -177,6 +178,22 @@ func main() {
 }
 ```
 
+`Stop()` function closes the listener connection:
+
+```go
+func main() {
+    r, _ := hare.Listen("3000")
+    hare.Send("3000", "Hey beauty")
+
+    r.Stop()
+
+    err := Send("3000", "This should fails")
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
 ## Examples
 
 You can check the [example](./examples) for code usages, like [send](./examples/send.go) and [listen](./examples/listen.go) samples.