New purrr function requests: purrr::list_modify, purrr:list_flatten, purrr:pluck

[PathosEthosLogos]

There are three functions in purrr that are not in tidytable.
They are namely list_modify(), list_flatten(), and pluck().
Would be really nice if they were included 😃

[markfairbanks]

Hmm I'll have to think about this one. At one point I had decided not to add any more purrr functions. I can see how they would be useful though.