Update examples/ding-dong-bot.ts

[pea-cake]

Variable name error

[CLAassistant]

All committers have signed the CLA.

[huan]

Please make sure the following requirements have been met for your PR before we can continue reviewing it:

1. You have signed the CLA by clicking the [CLA | not signed yet] button from the comments.
2. The PR has passed all the CI tests and turns green. (you can execute all tests locally by running npm test)

[huan]

Wechaty Contributors Nomination

Link to wechaty/PMC#16

[pea-cake]

Please make sure the following requirements have been met for your PR before we can continue reviewing it:

1. You have signed the CLA by clicking the [CLA | not signed yet] button from the comments.
2. The PR has passed all the CI tests and turns green. (you can execute all tests locally by running npm test)

ok, thanks

[huan]

Thank you very much for your contribution!

You are welcome to join Wechaty Contributor Program

1. Join Wechaty Organization

You've invited peacake to Wechaty! They'll be receiving an email shortly. They can also visit https://github.com/wechaty to accept the invitation.

I have invited you to join our Wechaty GitHub Organization, please accept it by following the above message. (See also: wechaty/PMC#16)

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Please add @lijiarui wechat: ruirui_0914 and send her this pr link. She will invite you into Wechaty Contributor Room

Cheers!

[pea-cake]

Cheers!

[lijiarui]

Please add yourself to our Website Contributors by creating a PR and refer to this PR link as well.

@pea-cake This link is outdated now, you can add your profile to our website by creating a PR here: https://github.com/wechaty/jekyll/tree/main/jekyll/_contributors