0.5.0

Remove attachment download login workaround in #5 (closes #1)

• Providing the Todoist account email and password is no longer necessary to download attachments

• Users are no longer prompted for email and password and all related command line parameters (--email, --password, --password-file) and environment variables (TODOIST_EMAIL, TODOIST_PASSWORD) have been removed.

Include todoist links in prompt (by @filippog) in #3