Add actions and buttons to incoming webhooks

Description

Proposed Help Wanted to Andrew Somervell & team

Request: https://mattermost.uservoice.com/forums/306457-general/suggestions/17678305-actions-and-buttons-to-incoming-webhooks

Andrew, as part of this PR, would you be open to updating the webhook docs?

Here's the page https://docs.mattermost.com/developer/webhooks-incoming.html, there's an "Edit" button in the top right corner to make a PR to update it.

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Eric Sethna
April 28, 2017, 2:10 AM

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Ian Tien

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