MinuteSnapshot missing 't' (timestamp), 'n' (transactions) #440

Python library dataclass missing fields returned by the API.

Updated version with newly added lines commented: # added

`
class MinuteSnapshot:
"Most recent minute bar."
accumulated_volume: Optional[float] = None
open: Optional[float] = None
high: Optional[float] = None
low: Optional[float] = None
close: Optional[float] = None
volume: Optional[float] = None
vwap: Optional[float] = None
otc: Optional[bool] = None
timestamp: Optional[int] = None # added
transactions: Optional[int] = None # added

@staticmethod
def from_dict(d):
    return MinuteSnapshot(
        d.get("av", None),
        d.get("o", None),
        d.get("h", None),
        d.get("l", None),
        d.get("c", None),
        d.get("v", None),
        d.get("vw", None),
        d.get("otc", None),
        d.get("t", None),        # added
        d.get("n", None),       # added
    )

`