update packages

vendor/github.com/gorilla/websocket/examples/chat/README.md

@@ -1,6 +1,6 @@
 # Chat Example
 
-This application shows how to use the
+This application shows how to use use the
 [websocket](https://github.com/gorilla/websocket) package to implement a simple
 web chat application.
 

vendor/github.com/gorilla/websocket/examples/chat/client.go

@@ -64,7 +64,7 @@ func (c *Client) readPump() {
 	for {
 		_, message, err := c.conn.ReadMessage()
 		if err != nil {
-			if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
+			if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
 				log.Printf("error: %v", err)
 			}
 			break
@@ -113,7 +113,7 @@ func (c *Client) writePump() {
 			}
 		case <-ticker.C:
 			c.conn.SetWriteDeadline(time.Now().Add(writeWait))
-			if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
+			if err := c.conn.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
 				return
 			}
 		}