node: v14.0.0

CLI version: 2.3.2

GitBook version: 3.2.3

Windows10

When execute `gitbook init` in an empty folder, it pops up:

```
$ gitbook init
warn: no summary file in this book
info: create SUMMARY.md

TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of Promise

```

And there is no "SUMMARY.md" created...
How could it be fixed？Thanks！