Remove redundant

Author: Derek-Wds

qlib/log.py

@@ -31,9 +31,6 @@ def __init__(self, module_name):
         self.module_name = module_name
         self.level = 0
 
-    def __reduce__(self):
-        return (QlibLogger, (self.module_name,))
-
     @property
     def logger(self):
         logger = logging.getLogger(self.module_name)