[Slack] Use socket mode instead of RTM API #1744
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RTM API is petty old api interface and enforces to use old-style Slack Apps (also known as "Classic" apps) which doesn't allow to use some new features (like org-wide app installations). Slack itself recommends to use Socket Mode (https://api.slack.com/rtm) for most applications.
If this approach is acceptable I can provide documentation how to install and configure Slack App to use it with socket mode.