Add repology.org to approved badges list

Add repology.org to the [Approved Badges list](https://code.visualstudio.com/api/references/extension-manifest#approved-badges) to allow their SVGs in README.md

Currently `vsce publish` fails with:

```
Error: SVGs are restricted in README.md; please use other file image formats, such as PNG: https://repology.org/badge/vertical-allrepos/typos-lsp.svg?exclude_unsupported=1
```