Changes in version 0.0.0.9010                      

  - New exported function get_shinyslack_team_id() provides the team id
    for the Slack workspace used for login.
  - Breaking: Removed slack_shiny_ui() from exports.
  - Breaking: The site url is now automatically determined, so site_url
    is no longer an argument to any function.
  - Breaking: The "real" ui is no longer automatically wrapped in a
    cookie handler. Many UIs that use shinyslack won't need to deal with
    cookies in the normal app, so we shouldn't add extra, unnecessary
    javascript.
  - Abstracted UI switcher into {scenes} package.
  - Added a NEWS.md file to track changes to the package.