Release googledrive 2.1.1

[jennybc]

Prepare for release:

• [x] git pull
• [x] Close v2.1.1 milestone
• [x] Check current CRAN check results
• [x] Bump required R version in DESCRIPTION to 3.6
• [x] Polish NEWS
• [x] urlchecker::url_check()
• [x] devtools::build_readme()
• [x] Remove the dependency on dev gargle
• [x] devtools::check(remote = TRUE, manual = TRUE)
• [x] devtools::check_win_devel()
• [x] revdepcheck::cloud_check()
• [x] Update cran-comments.md
• [x] git push
• [x] devtools::build_rmd("index.Rmd")

Submit to CRAN:

• [x] usethis::use_version('patch')
• [x] devtools::submit_cran()
• [x] Approve email

Wait for CRAN...

• [x] Accepted :tada:
• [x] usethis::use_github_release()
• [x] usethis::use_dev_version(push = TRUE)

[jennybc]

I'm not going to "fix" these until I see if win-builder reports them:

> urlchecker::url_check()
✖ Error: man/drive_endpoints.Rd:33:76 404: Not Found
about the parameters. This list is derived programmatically from the \href{https://www.googleapis.com/discovery/v1/apis/drive/v3/rest}{Drive API v3 Discovery Document} using
                                                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
✖ Error: man/request_generate.Rd:40:7 404: Not Found
\href{https://www.googleapis.com/discovery/v1/apis/drive/v3/rest}{Discovery Document}. Most
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

They did get flagged on win-builder so I did "fix" them, i.e. turned them into not-URLs.

[jennybc]

Consider restoring the fake OAuth client temporarily. googlesheets4 will fail revdep check like this otherwise:

*   checking examples ... ERROR

Running examples in ‘googlesheets4-Ex.R’ failed
The error most likely occurred in:

> ### Name: gs4_auth_configure
> ### Title: Edit and view auth configuration
> ### Aliases: gs4_auth_configure gs4_api_key gs4_oauth_client
> 
> ### ** Examples
> 
> # see and store the current user-configured OAuth client (probably `NULL`)
...
> # this example JSON is indicative, but fake
> path_to_json <- system.file(
+   "extdata", "data", "client_secret_123.googleusercontent.com.json",
+   package = "googledrive"
+ )
> gs4_auth_configure(path = path_to_json)
Error: parse error: premature EOF

                     (right here) ------^
Execution halted
```

Alternatively, I guess I could submit googlesheets4, then googledrive? I'll have to think if there's some other reason that that order doesn't work.

Update: I **did** release googlesheets4 first.