Support for update-rows operation?

[tcash21]

Hello, I need to set a value for a picklist column, but the API doesn't seem to allow this via ss_add_rows.

Error in `ss_api()`:
! SmartSheet API request failed [400]
Value is not supported for this column type. Use objectValue instead.

Are you planning on adding an API call for updating rows? I may be able to help contribute if not. Thank you.

[cole-johanson]

@tcash21 yes, there is a PR for updating rows. See #9. I plan on publishing later this month, but in the mean time, feel free to install the develop branch.