inviteeList is not a list on room join event

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0. Report Issue Guide

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```
rm -rf package-lock.json
rm -rf node_modules
npm install
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1. Versions

What is your wechaty version? Answer: 0.40.10
What is your wechaty-puppet-donut version? Answer:
What is your node version? (run node --version) Answer: v13.12.0
What os are you using Answer: Mac

2. Describe the bug

Give a clear and concise description of what the bug is.

The inviteeList is an object when I invite one person into the room.

room.on('join', (room, inviteeList, inviter) =>

3. To Reproduce

This part is very important: if you can not provide any reproduce steps, then the problem will be very hard to be recognized.

Steps to reproduce the behavior:

run '...'
...
...

4. Expected behavior

Give a clear and concise description of what you expected to happen.

5. Actual behavior

If applicable, add screenshots to help explain your problem. But do not paste log screenshots here.

6. Full Output Logs

Set env WECHATY_LOG=silly in order to set log level to silly, then we can get the full log (If you dosen't set log env, log level is info as default, we cannot get the full log)

We need full log instead of log screenshot or log fragments!

Show Logs

```shell $ WECHATY_LOG=silly node yourbot.js Question: Paste your FULL(DO NOT ONLY PROVIDE FRAGMENTS) log messages Answer: ```

7. Additional context

Add any other context about the problem here.

[bug]

juzibot / donut-tester