diff --git a/okx/client.py b/okx/client.py
index a86dfe3..d8dc956 100644
--- a/okx/client.py
+++ b/okx/client.py
@@ -51,4 +51,4 @@ class Client(object):
         if response.status_code == 200:
             return response.json()['data'][0]['ts']
         else:
-            return ""
\ No newline at end of file
+            return ""