Incorrect Monthly FOP in Currency Futures

[AlexCatarino]

Expected Behavior

Only quarterly contracts (Mar, Jun, Sep, Dec) has FOP

Actual Behavior

We are FOP for non-quarterly contracts:
2019-01-02 09:31:00 : | 6A14F19 :: 20190104
2019-01-02 09:31:00 : | 6A15G19 :: 20190208
2019-01-02 09:31:00 : | 6A18H19 :: 20190308
FOP expiring on 20190104, 20190208 and 20190308 refers to 6A18H19, not F19 and G19.

See https://www.cmegroup.com/markets/fx/g10/euro-fx.contractSpecs.options.html

Potential Solution

Reproducing the Problem

class CurrencyFutureAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        self.set_start_date(2019,1, 1)
        self.set_end_date(2019,1, 15)
        self._future = self.add_future("6A")
        self._future.set_filter(0,92)
        self.add_future_option(self._future, option_filter=lambda x: x.calls_only().strikes(0,1))
        self._day = 0

    def on_data(self, slice: Slice) -> None:
        if self.time.day == self._day:
            return
        for symbol, chain in slice.option_chains.items():
            self.log(f'{symbol.underlying.value} :: {",".join(sorted(set([f"""{x.expiry:%Y%m%d}""" for x in chain])))}')
            self._day = self.time.day

Checklist

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• I have confirmed that this issue exists on the current master branch
• I have confirmed that this is not a duplicate issue by searching issues
• I have provided detailed steps to reproduce the issue

[Romazes]

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