TODO
Introduce log messages
mark_draft_invoice
Depricated in version 1.13.0 in favor of mark_invoice().
Use type hints on required arguments
Handle errors for multiple line items in update_invoice_line_item
Support errors on delete_invoice_item_category
Add tests for update_estimate_line_item
Support archive a user
https://help.getharvest.com/api-v2/users-api/users/users/#archive-a-user
Support make a user an admin
https://help.getharvest.com/api-v2/users-api/users/users/#make-a-user-an-admin
Support make a user a project manager
https://help.getharvest.com/api-v2/users-api/users/users/#make-a-user-a-project-manager
Fix installation documentation
Fix README.md instructions for installation
Improve instructions in sales material for installing the archive