Using `text` instead of `message` to send the body of the msg.

https://github.com/parkr/hubot-stenographer/blob/8eee7d0a287c659e9ef125e84e1e4cd6aa245165/src/stenographer.coffee#L75
https://github.com/parkr/witness/blob/6b2c866a58a45060a489c4d0b4492d03934007e6/lib/witness/api.rb#L32