Set bot to respond only to the ambient event

[yaron-idan]

• [V ] I've read and understood the Contributing guidelines and have done my best effort to follow them.
• [V ] I've read and agree to the Code of Conduct.
• [V ] I've searched for any related issues and avoided creating a duplicate issue.

Description

Trying to launch bot in ambient mode

Reproducible in:

• [V ] This is reproducible in the sample project.
  RTMBot version: 0.4.0
  Python version: 3.6.3
  OS Version: 10.13.1

Expected result:

I'm trying to launch the bot in a way that will allow interacting with him in a specific channel only, responding to every message in said channel.

Actual result:

Right now the bot responds to direct messages and mentions, which is something we would like to achieve.

I saw similar functionality to what I'm seeking in this bot's readme - https://github.com/saviogl/slack-rtm-bot, wondering if it's possible with python-rtmbot.
Thanks!