Add `--exclude` option to `subscriptions` command

[jfrerich]

Currently, subscriptions allow adding repositories or an organization to a subscription.

This request is to add a --exclude flag that will allow excluding repositories from the notification.

/github subscriptions add mattermost,label:"Severity/Critical" --exclude mattermost/mattermost-server,mattermost/mattermost-webapp

An example would be to subscribe a channel to all mattermost organization repositories but exclude the webapp, redux, and server repositories.

[balan2010]

Hi! I would like to work on this

[larkox]

All yours @balan2010 . Thanks!

[balan2010]

Cheers :-)

[jfrerich]

Woohoo! Thanks, @balan2010! This feature will be so helpful

[balan2010]

No Worries.. About to start working on this issue

[hanzei]

Reopening as https://github.com/mattermost/mattermost-plugin-github/pull/457 has been reverted

[hanzei]

@sanjaydemansol Assigning you as you are working on https://github.com/mattermost/mattermost-plugin-github/pull/505