docs: add ljosberinn as a contributor (#154)

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

Author: allcontributors[bot]

README.md

@@ -13,9 +13,7 @@ practices.
 <hr />
 
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
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 [![All Contributors](https://img.shields.io/badge/all_contributors-8-orange.svg?style=flat-square)](#contributors-)
-
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 **Playground for [testing-library/dom]**
@@ -122,7 +120,6 @@ Thanks goes to these people ([emoji key][emojis]):
 
 <!-- markdownlint-enable -->
 <!-- prettier-ignore-end -->
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 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors][all-contributors] specification.