Add bot_profile to messages

[Jmainguy]

Add testing for new fields

[Jmainguy]

I am not a slack expert, but with slack.OptionDebug(true), I get this output when receiving a message from a bot.

{
    "type": "message",
    "subtype": "bot_message",
    "text": "<@U01AN1UT741> has created a new story for estimation.",
    "suppress_notification": false,
    "bot_id": "B01AZA490HE",
    "team": "T01A9CUMPQA",
    "bot_profile": {
        "id": "B01AZA490HE",
        "deleted": false,
        "name": "storypoker",
        "updated": 1599574335,
        "app_id": "A6DB2SWUW",
        "icons": {
            "image_36": "https://slack-files2.s3-us-west-2.amazonaws.com/avatars/2017-10-24/261138718469_ada58732a18da119678d_36.png",
            "image_48": "https://slack-files2.s3-us-west-2.amazonaws.com/avatars/2017-10-24/261138718469_ada58732a18da119678d_48.png",
            "image_72": "https://slack-files2.s3-us-west-2.amazonaws.com/avatars/2017-10-24/261138718469_ada58732a18da119678d_72.png"
        },
        "team_id": "T01A9CUMPQA"
    },
    "blocks": [],
    "channel": "C01AZ844Z32",
    "event_ts": "1599574912.002300",
    "ts": "1599574912.002300"
}

Username/Icons is not always passed, but the bot_profile appears to be in my testing, so adding it as a possibility here is super helpful.

Also, why this output is so different from https://api.slack.com/events/message/bot_message I would be glad to hear, is Slacks API docs just lagging behind?

[kanata2]

Also, why this output is so different from https://api.slack.com/events/message/bot_message I would be glad to hear, is Slacks API docs just lagging behind?

Yes, Slack API doc does not necessarily show the latest specifications...

[kanata2]

Thanks!
Looks good to me :)