message: DOCS: mark username optional as it's not needed when using a token
diff: @@ -31,7 +31,7 @@ a structure with up to four elements:
  - `host`: The host of the Bitbucket instance, e.g. `bitbucket.company.com`.
  - `token` (optional): An personal access token as expected by Bitbucket. Either
  an access token **or** a username + appPassword may be supplied.
  -- `username`: The Bitbucket username to use in API requests. If neither a
  +- `username` (optional): The Bitbucket username to use in API requests. If neither a
  username nor token are supplied, anonymous access will be used.
  - `appPassword` (optional): The password for the Bitbucket user. Only needed
  when using `username` instead of `token`.
  