Update README.md

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Patrick Stevens
2020-10-28 20:00:34 +00:00
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# Red-black tree
This is a basic implementation of a red-black tree in F#, which is pretty close to being correct by construction.
The invariants are imposed at the type level, so that if you have successfully constructed a tree, it is automatically a red-black tree (though we cannot help you get elements the right way round, so we can't guarantee that traversal is in sorted order; that is ensured by property-based and exhaustive testing).
## Things to fix