Only require 1 legacy param to make a retry policy.
Only require 1 legacy param to make a retry policy.

slackapi/node-slack-sdk,slackhq/node-slack-client,peernohell/node-slack-client,peernohell/node-slack-client,slackapi/node-slack-sdk,slackapi/node-slack-sdk,slackhq/node-slack-sdk,slackapi/node-slack-sdk