Add numpy support

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 lines in your changes are missing coverage. Please review.

:exclamation: No coverage uploaded for pull request base (fix_max_frames@9f8869a). Click here to learn what that means.

Files	Patch %	Lines
streamjoy/serializers.py	92.30%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## fix_max_frames #27 +/- ## ================================================= Coverage ? 77.20% ================================================= Files ? 12 Lines ? 1193 Branches ? 0 ================================================= Hits ? 921 Misses ? 272 Partials ? 0 ```

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