add headers

[rkass]

Without these headers I get a 500 response back from resy on the /find endpoint

[ringle24]

@rkass I am getting 500 response back as well - how do I fix this - I have resy version 0.6.0

@lgrees Have these headers been merged into the code base? 0.6.0 is from Feb I think..

Error: failed to fetch slots for date, status code: 500
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