SLACK_API_TOKEN in SlackError

[levenleven]

SlackError contains env.response, including request headers and SLACK_API_TOKEN

slack-ruby-client/lib/slack/web/faraday/response/raise_error.rb

Line 19 in f2423d4

raise error_class.new(error_message, env.response)

This can be a foot gun as the token can be accidentally leaked by e.g. logging the error puts err.inspect.

Maybe we could auto redact auth header or even avoid storing whole response in the error instance and keep only e.g. body/status (but I guess this would be a breaking change)?