Update README.md

Co-authored-by: Radu Weiss <[email protected]>

Author: sandreim

README.md

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 This crate is currently used for cross-version serialization with the [Firecracker snapshot-restore dev preview](https://github.com/firecracker-microvm/firecracker/tree/v0.23.0), but has not been tested for other use cases. It should be considered **experimental software** outside the Firecracker context. It’s likely that this crate will see both interface and implementation changes in the future.
 
 ## Description
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 Exports the Versionize derive proc macro that generates the Versionize implementation for structs and enums by using annotations.