Update Mattermost settings to v3.1.0
Updates config.json settings for Mattermost v 3.1.0 ( https://github.com/mattermost/platform/blob/v3.1.0/config/config.json )
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Updates config.json settings for Mattermost v 3.1.0 ( https://github.com/mattermost/platform/blob/v3.1.0/config/config.json )