More devtools commands for R package

[jooyoungseo]

The following devtools commands are frequently used for R package develpment. It would be nice if they could be added to R package commands.

• devtools::release()
• devtools::spell_check()
• devtools::check_rhub()
• devtools::check_win_devel()
• devtools::dev_mode()

[github-actions]

This issue is stale because it has been open for 365 days with no activity.

[github-actions]

This issue was closed because it has been inactive for 14 days since being marked as stale.