Check major version only if it exists

node.go

@@ -77,10 +77,11 @@ type FrameStats struct {
 func (node *Node) open(ctx context.Context) error {
 	header := http.Header{}
 
-	header.Set("User-Agent", gavalinkUserAgent())
 	header.Set("Authorization", node.config.Password)
 	header.Set("Num-Shards", strconv.Itoa(node.manager.shards))
 	header.Set("User-Id", node.manager.userID)
+	header.Set("Client-Name", "Gavalink")
+	header.Set("User-Agent", gavalinkUserAgent())
 
 	if node.manager.capabilities != nil {
 		v := make([]string, 0)
@@ -104,16 +105,19 @@ func (node *Node) open(ctx context.Context) error {
 		return err
 	}
 
+	// TODO: This isn't officially required, so we ignore it for now if it's empty.
 	vstr := resp.Header.Get("Lavalink-Major-Version")
 
-	v, err := strconv.Atoi(vstr)
+	if vstr != "" {
+		v, err := strconv.Atoi(vstr)
 
-	if err != nil {
-		return err
-	}
+		if err != nil {
+			return err
+		}
 
-	if v < 3 {
-		return errInvalidVersion
+		if v < 3 {
+			return errInvalidVersion
+		}
 	}
 
 	node.wsConn = ws