Fix the linting issue

## Description

Because the `Core` object is the interface of `async components`, it will lead to many linting issues. We should make some changes in [itchat-uos](https://github.com/why2lyj/ItChat-UOS) project to make the puppet-itchat pass the linting test. 

Related to: https://github.com/why2lyj/ItChat-UOS/issues/3

