new types of AccountBookItem

[tsinin]

got Invalid value for type (bonus_offset), must be one of ['dnw', 'pnl', 'fee', 'refr', 'fund', 'point_dnw', 'point_fee', 'point_refr']
while trying to get futures account book.

I guess it is because of some bonuses that applies to account last time on GateIo. bonus_offset is not the only new type, there are more.
So now it is impossible to use this function (list_futures_account_book). Fix it, please

[revilwang]

The latest 4.60.2 has been updated to pypi which includes the missing bonus_offset.
In the next major version, we're planning to remove the value check to make sure new field values won't affect old versions