rtm.start Deprecation

[mmuyskens]

Slack has sent out a recent deprecation notice for rtm.start - The timeline is;

November 30, 2021 - New Slack apps and integrations will no longer be able to use rtm.start and must use rtm.connect instead.

September 20, 2022 - The response from rtm.start will transform into the brief response found in the method that replaces it, rtm.connect.