correct init of client in readme

diff --git a/README.md b/README.md
index 741a6dc..d1ad90e 100644 (file)
--- a/README.md
+++ b/README.md
@@ -6,8 +6,9 @@
 
 ```
 const bytom = require('bytom-sdk')
+const url = 'http://localhost:9888'
 
-const client = new bytom.Client()
+const client = new bytom.Client(url)
 ```
 
 ## Interaction with bytom