Update connection.py

修复_check_pid 传参数错误

fdfs_client/connection.py

@@ -97,7 +97,7 @@ class ConnectionPool(object):
     def _check_pid(self):
         if self.pid != os.getpid():
             self.destroy()
-            self.__init__(self.conn_class, self.max_conn, **self.conn_kwargs)
+            self.__init__(self.pool_name, self.conn_class, self.max_conn, **self.conn_kwargs)
 
     def make_conn(self):
         '''Create a new connection.'''