add since and until (lichess)

[py-b]

A proposition for adding a filter by date for the get_raw_lichess function.

[JaseZiv]

Thanks for the PR @py-b!

Can you also complete the following:

• Update the version in the DESCRIPTION file to 1.5.3
• Update NEWS.md
• Update test(s) in tests/testthat/test-chessR.R
• Provide a summary of devtools::check()

[py-b]

Done. ✅

Here is the summary of devtools::check() :

-- R CMD check results -------------------------------------------------------------------------------- chessR 1.5.3 ----
Duration: 6m 11.2s

> checking for unstated dependencies in examples ... OK
   WARNING
  'qpdf' is needed for checks on size reduction of PDFs

> checking package dependencies ... NOTE
  Package suggested but not available for checking: 'chess'

0 errors v | 1 warning x | 1 note x

[JaseZiv]

Looks good.

Thanks for making all those changes!