Is your feature request related to a problem? Please describe.
The API offers X-RATE-Limit and X-RATE-Remaining, but no X-Rate-resetAt.

Describe the solution you'd like
The headers should include a X-Rate-ResetAt.

Describe alternatives you've considered
The value could be a unix timestamp or a zoned date time.

Additional context
X-Rate-resetAt is very valuable in case someone is reaching the limit, but it also fully specifies the rate limit per period. Currently, the information on the rate limit is 1,000 / unknown time period.