UPDATE README

Author: molanp

README.md

@@ -61,7 +61,7 @@ mcsm.login("username", "password")
 mcsm.login_with_apikey("apikey")
 
 # Get dashboard data
-overview = mcsm.overview()
+overview = mcsm.overview
 overview_data = overview.overview()
 
 # Get MCSM version

README_zh-cn.md

@@ -61,7 +61,7 @@ mcsm.login("username", "password")
 mcsm.login_with_apikey("apikey")
 
 # 获取仪表盘数据
-overview = mcsm.overview()
+overview = mcsm.overview
 overview_data = overview.overview()
 
 # 获取 MCSM 版本