tinyspeck/hubot-slack — pull request #59 by alexhouse (2014-05-23 12:22:11+00:00)
Title: Allowing `mrkdwn_in` in the attachments for `Slack.custom`

Slack allows for Markdown formatting in attachments, but only on a requested basis: [https://api.slack.com/docs/formatting](see here)

This PR allows for custom messages sent via Slack adapter to include the necessary field (defaulting to none)