[BUG] Anchors may have invalid chars that break the links

[Fred-Vatin]

VS Code version	OS	Extension version
1.14.0	Win 10 x64 pro (french) 14393	0.8.1

Steps to reproduce

Use extension to create/update the TOC will produce this:

<!-- TOC -->

- [Valid link](#valid-link)
- [Invalid _link_](#invalid-_link_)
- [Another invalid link ([a link](https://link.com))](#another-invalid-link-a-linkhttpslinkcom)

<!-- /TOC -->

<a id="markdown-valid-link" name="valid-link"></a>
## Valid link

<a id="markdown-invalid-_link_" name="invalid-_link_"></a>
## Invalid _link_


<a id="markdown-another-invalid-link-a-linkhttpslinkcom" name="another-invalid-link-a-linkhttpslinkcom"></a>
## Another invalid link ([a link](https://link.com))

Results

Second and third links are broken in TOC.

Expectations

Extension must remove invalid chars such as _ or links in title to build valid reference targets. So the code above should be:

<!-- TOC -->

- [Valid link](#valid-link)
- [Invalid _link_](#invalid-link)
- [Another invalid link (a link)](#another-invalid-link)

<!-- /TOC -->

<a id="markdown-valid-link" name="valid-link"></a>
## Valid link

<a id="markdown-invalid-link" name="invalid-link"></a>
## Invalid _link_

<a id="markdown-another-invalid-link" name="another-invalid-link"></a>
## Another invalid link ([a link](https://link.com))

Note: the third link still won't work in VSCode but do in GitHub.

Regards

[alanwalk]

Thank your for your issue. I had fixed it, i will release new version in recent days.