Fix JSON Read example

README.md

@@ -88,7 +88,7 @@ jc := websocket.JSONConn{
 }
 
 var v interface{}
-err = jc.Read(ctx, v)
+err = jc.Read(ctx, &v)
 if err != nil {
 	log.Fatalf("failed to read json: %v", err)
 }

example_test.go

@@ -122,7 +122,7 @@ func ExampleDial() {
 	}
 
 	var v interface{}
-	err = jc.Read(ctx, v)
+	err = jc.Read(ctx, &v)
 	if err != nil {
 		log.Fatalf("failed to read json: %v", err)
 	}