Log Message:
(www/R-googledrive) Updated 2.0.0 to 2.1.0

# googledrive 2.1.0

## Syncing up with gargle

Version 1.3.0 of gargle introduced some changes around OAuth and
googledrive is syncing up that:

* `drive_oauth_client()` is a new function to replace the
  now-deprecated `drive_oauth_app()`.

* The new `client` argument of `drive_auth_configure()` replaces the
  now-deprecated `app` argument.

* The documentation of `drive_auth_configure()` emphasizes that the
  preferred way to "bring your own OAuth client" is by providing the
  JSON downloaded from Google Developers Console.

## Shared drives

`drive_ls(recursive = TRUE)` now works when the target folder is on a
shared drive (#265, @Falnesio).

`drive_mv()` no longer errors with "A shared drive item must have
exactly one parent." when moving a file on a shared drive (#377).

## Other

`drive_auth()` now warns if the user specifies both `email` and
`path`, because this is almost always an error (#420).

`drive_auth_config()` was deprecated in googledrive 1.0.0 (released
2019-08-19) and is now defunct.

`drive_example()` was deprecated in googledrive 2.0.0 (released
2021-07-08) and is now defunct.