add note to caching docs about special cases `last` and `now`

ropensci / rerddap

R client for working with ERDDAP servers

https://docs.ropensci.org/rerddap

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Closed sckott closed 6 years ago

sckott commented 7 years ago

via #51

sckott commented 7 years ago

see section Cacheing, “last”, “now”, idempotency, and a gotcha