Make `progress_percent` optional

[aburkhalter512]

I discovered that this field wasn't returned when state == "pending" so processing_info wouldn't get deserialized. I did not make state optional since the twitter docs seem to indicate that if processing_info exists, then so does state, but I could be convinced to make it optional anyways.

[codecov[bot]]

Codecov Report

Merging #331 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #331   +/-   ##
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  Coverage   92.48%   92.48%           
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  Files          77       77           
  Lines        1157     1157           
  Branches        6        6           
=======================================
  Hits         1070     1070           
  Misses         87       87           

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[aburkhalter512]

@DanielaSfregola just to be clear do you want me to make state optional as well?

Thanks for your super speedy review!

[DanielaSfregola]

Hi @aburkhalter512, I wouldn't change it for now since the documentation does say that state is always returned.

Of course, if we realize that this is not the case, we can change it to optional later! ;)

[DanielaSfregola]

LGTM