Updated README

Updated README to reflect changes in AsyncAPI Preview.

Author: ivangsa

README.md

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 [![Marketplace Version](https://vsmarketplacebadges.dev/version/asyncapi.asyncapi-preview.svg 'Current Release')](https://marketplace.visualstudio.com/items?itemName=asyncapi.asyncapi-preview) [![Marketplace Downloads](https://vsmarketplacebadges.dev/downloads-short/asyncapi.asyncapi-preview.svg 'Current Release')](https://marketplace.visualstudio.com/items?itemName=asyncapi.asyncapi-preview.svg)
 
 # AsyncAPI Preview
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 Preview AsyncAPI documents inside VSCode.
 
 AsyncAPI Preview was simplified and reworked from scratch to use the latest [@asyncapi/asyncapi-react](https://github.com/asyncapi/asyncapi-react/tree/next), removing old dependencies on Express, socket.io and js-yaml with better startup performance and bundle size.