Update authors in DESCRIPTION

[wch]

This change is meant to address a message from BDR:

CRAN packages referring to 'Mango Solutiond'

That is

    mangoTraining pak processx remotes sasMap shinytest

'Mango Solutions' as a software company appears no longer to exist: it
may mow be part of 'Ascent Digital Science'. As the manual says [cph]
refers to

"(copyright holder, which should be the legal name for an institution or
corporate body)"

and needs to be identifiable to people wiching to ask for copyright
permissions.

And where they are not the only named copyright holder it needs to be
made clear which parts are owned by which copyright holder.

Likely RStudio as copyright holder needs to be updated.