Update README.md

Author: PKUJohnson

README.md

@@ -36,7 +36,7 @@ pip install python_snappy-0.5.1-cp27-cp27m-win_amd64.whl
 from .data_api import DataApi  # 这里假设工作目录是项目根目录
 
 api = DataApi(addr="tcp://data.tushare.org:8910")
-result, msg = api.login("username", "password") # 示例账户，用户需要改为自己在www.quantos.org上注册的账户
+result, msg = api.login("username", "token") # 示例账户，用户需要改为自己在www.quantos.org上注册的账户
 print(result)
 print(msg)