fix(readme): testing note format

README.md

@@ -2,12 +2,9 @@
 
 ImapFlow is a modern and easy-to-use IMAP client library for Node.js.
 
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+> [!NOTE]
 > Managing an IMAP connection is cool, but if you are only looking for an easy way to integrate email accounts, then ImapFlow was built for [EmailEngine Email API](https://emailengine.app/). It's a self-hosted software that converts all IMAP accounts to easy-to-use REST interfaces.
 
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 The focus for ImapFlow is to provide easy to use API over IMAP. Using ImapFlow does not expect knowledge about specific IMAP details. A general understanding is good enough.
 
 IMAP extensions are handled in the background, so, for example, you can always request `labels` value from a {@link FetchQueryObject|fetch()} call, but if the IMAP server does not support `X-GM-EXT-1` extension, then `labels` value is not included in the response.