Support Bot Token instead of Webhook URL

[lazno]

Webhook Urls are tied to a slack channel and thus are not very flexible.

Using slack bot tokens this could be easily fixed.

I already tried to make a PR, but since i am not that familiar with node projects, i failed to release a test version.

In essence one only has to POST to https://slack.com/api/chat.postMessage with the bot token as Bearer and the channel id in the body.

I could see you guys supporting both with minimal effort by modifying buildPayload and notifySlack methods

My inspiration came from https://github.com/devkyt/slack-send-msg and several other implementations. However they do not offer such a nice message API as you guys do, so i would rather contribute here.

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