Post custom messages to mutl

[marcusdroy]

The slack plugin should be able to let you send a custom attachment to multiple channels by providing a list of slack channels or users to message to.

[nhmathis]

Hi @marcus174,

This has been merged and version 4 of the plugin has been released. As discussed in Issue #5, there was a content id that was expected in the Attachment payload. This is not standard to the expected payload. It instead should be attachments. I've updated the plugin to reflect as such. However, this means that your integration will likely need a small update.

The multiple slack channel logic has also been improved to minimize redundant checks.

-Nick