## Summary

(Describe the goal of this PR. Mention any related Issue numbers)

### Category (place an `x` in each of the `[ ]`)

- [ ] **slack.web.WebClient** (Web API client)
- [ ] **slack.webhook.WebhookClient** (Incoming Webhook, response_url sender)
- [ ] **slack.web.classes** (UI component builders)
- [ ] **slack.rtm.RTMClient** (RTM client)

## Requirements (place an `x` in each `[ ]`)

- [ ] I've read and understood the [Contributing Guidelines](https://github.com/slackapi/python-slackclient/blob/main/.github/contributing.md) and have done my best effort to follow them.
- [ ] I've read and agree to the [Code of Conduct](https://slackhq.github.io/code-of-conduct).
- [ ] I've run `python setup.py validate` after making the changes.

## Summary

(Describe the goal of this PR. Mention any related Issue numbers)

### Category (place an `x` in each of the `[ ]`)

- [ ] **slack.web.WebClient** (Web API client)
- [ ] **slack.webhook.WebhookClient** (Incoming Webhook, response_url sender)
- [ ] **slack.web.classes** (UI component builders)
- [ ] **slack.rtm.RTMClient** (RTM client)
- [ ] Documents
- [ ] Others

## Requirements (place an `x` in each `[ ]`)

- [ ] I've read and understood the [Contributing Guidelines](https://github.com/slackapi/python-slackclient/blob/main/.github/contributing.md) and have done my best effort to follow them.
- [ ] I've read and agree to the [Code of Conduct](https://slackhq.github.io/code-of-conduct).
- [ ] I've run `python setup.py validate` after making the changes.

Add other categories in PR template
Add other categories in PR template
