bibox: timestamp should be in milliseconds
bibox: timestamp should be in milliseconds

cf eg [huobipro.js timestamp handling](https://github.com/ccxt/ccxt/blob/14355ca3482d68cef4b260601b308055e1d62f6b/js/huobipro.js#L237)
ccxt/ccxt,ccxt/ccxt,ccxt/ccxt,ccxt/ccxt,ccxt/ccxt