Update README.md

Author: nmdias

README.md

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 FeedKit is a Swift library for Reading and Generating RSS, Atom, and JSON feeds.
 
-### FeedKit v10 (Release Candidate) :warning:
-
-FeedKit **[`v10`](https://github.com/nmdias/FeedKit)** is now in Release Candidate (RC) and introduces a new parsing engine, features, and improvements. While this version is feature-complete and extensively tested, it may still have some minor issues to address before the final release.
-
-It should be stable enough :eyes:, but if stable enough is not enough, consider using **[`v9`](https://github.com/nmdias/FeedKit/releases/tag/9.1.2)**.
-
 # Features
 
 - [x] [Atom](https://tools.ietf.org/html/rfc4287)