Update CONTRIBUTING.md

Author: heath-freenome

CONTRIBUTING.md

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 # Contributing to React-JSONSchema-Form
-*Welcome, and thank you for considering contributing!*<br>
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+*Welcome, and thank you for considering contributing!*
+
 Whether you’re reporting bugs, suggesting enhancements or writing code your help is always appreciated.
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 ## 1. Code of Conduct
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 Please abide by our [Code of Conduct](CODE_OF_CONDUCT.md) to maintain a welcoming, inclusive project environment.
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 ## 2. Getting Started
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 This guide will help you understand how to contribute effectively to React-JSONSchema. [Contributor's guide](https://rjsf-team.github.io/react-jsonschema-form/docs/contributing)