Calling optionsDF with a strategy parameter throws an error.

[JimCollinsDC]

Describe the bug
Calling optionsDF with a strategy parameter throws an error, KeyError: 'tradeTimeInLong', because the 'Strategy' parameter returns a JSON object of potential trades matching that strategy.

To Reproduce
Steps to reproduce the behavior:

1. Run options = td.optionsDF(symbol='SPY',strategy="VERTICAL",interval=5)
2. see error
3. Run options = td.options(symbol='SPY',strategy="VERTICAL",interval=5)
4. see expected result

Expected behavior
I would expect the error to be caught and/or calling optionsDF with a strategy parameter to return some sort of error code

Additional context
I would fork this, fix the error, and submit a pull request, but not sure of the best way to fix this.