Update Outgoing-Webhooks.md

doc/integrations/webhooks/Outgoing-Webhooks.md

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 # Outgoing Webhooks
 
+#### [To be released in Mattermost v1.2, available now on master]
+
 Outgoing webhooks allow external applications, written in the programming language of your choice--to receive HTTP POST requests whenever a user posts to a certain channel, with a trigger word at the beginning of the message, or a combination of both. If the external application responds appropriately to the HTTP request, as response post can be made in the channel where the original post occurred.
 
 A couple key points: