Configuration
You can configure Events support globally.
Slack::Events.configure do |config|
  config.signing_secret = 'secret'
end
The following settings are supported.
| setting | description | 
|---|---|
| signing_secret | Slack signing secret, defaults is ENV['SLACK_SIGNING_SECRET']. |  
| signature_expires_in | Signature expiration window in seconds, default is 300. |