Flolagale/mailin — pull request #5 by robguthrie (2014-07-08 02:42:38+00:00)
Title: Add Content-Type header to indicate to webhook that we have json for it

I'm using Mailin with a Rails 4 application, and I was having trouble because without the Content-Type header being set correctly, rails parses the json as a plain string.

This adds the Content-Type header to the post made to the webhook.