[GH-744] Add --include-only-org-members flag

source/integrate/github-interoperability.rst

@@ -139,6 +139,7 @@ For example, to post notifications for issues, issue comments, and pull requests
 
 - ``--features``: A comma-delimited list of one or more of: issues, pulls, pulls_merged, pulls_created, pushes, creates, deletes, issue_creations, issue_comments, pull_reviews, releases, label:"labelname". Defaults to ``pulls,issues,creates,deletes``.
 - ``--exclude-org-member``: The events triggered by organization members that won't be delivered. It will be locked to the organization configured and only works for users whose membership is public. Organization members and collaborators are not the same.
+- `--include-only-org-members`: events triggered only by organization members will be delivered. It will be locked to the organization provided in the plugin configuration and it will only work for users whose membership is public. Note that organization members and collaborators are not the same.
 - ``--render-style``: Notifications are delivered in the specified style (for example, the body of a pull request will not be displayed). Supported values are ``collapsed``, ``skip-body``, or ``default`` (which is the same as omitting the flag).
 - ``--exclude``: A comma-separated list of the repositories to exclude from getting the subscription notifications like ``mattermost/mattermost-server``. Only supported for subscriptions to an organization.