Pixiu

**Descriptions：**
1.fix dependencies bugs
remove oeoeweb library
add pymongo library
2.fix sample.py, sample2.py errors.
3.API add AcquireLock, ReleaseLock


[2021-06-04]
Version:
Package:

**Descriptions：**
1.Modify API:
1)
def CloseOrder(self, uid, price, volume: float, slippage=None, arrow_color=None) -> (ErrorID, OrderResult)
->
def CloseOrder(self, uid, volume=None, price=None, slippage=None, arrow_color=None) -> (ErrorID, OrderResult)
2.fix:
__valid_order__: EID_EAT_INVALID_ORDER_CLOSE_PRICE
3.Add:
__order_close_price__


[2021-06-03]
Version:
Package:

**Descriptions：**
1.fix bugs GetSymbolData('*')
2.
self.orders['ds'] -> order['__ds__']
self.account_info['ds'] -> self.account_info['__ds__']
3.Add build-in :
datetime, timedelta, random

[2021-06-01]
Version:
Package:

**Descriptions：**
1.add APIs:
WaitCommand
2.modify APIs:
Buy, Sell, CloseOrder, ModifyOrder return order_uid -> OrderResult

[2021-05-31]
Version:
Package:

**Descriptions：**
1.fix EATesterPrintCollector._call_print write_log bug

[2021-05-30]
Version:
Package:

**Descriptions：**
1. get_url_data add headers

[2021-05-29]
Version:
Package: