update readme after renaming

Author: jorendorff

README.md

@@ -4,7 +4,7 @@ A collection of useful algorithms written in Rust. Currently contains:
 
 - [`geo_filters`](crates/geo_filters): probabilistic data structures that solve the [Distinct Count Problem](https://en.wikipedia.org/wiki/Count-distinct_problem) using geometric filters.
 - [`bpe`](crates/bpe): fast, correct, and novel algorithms for the [Byte Pair Encoding Algorithm](https://en.wikipedia.org/wiki/Large_language_model#BPE) which are particularly useful for chunking of documents.
-- [`utf8-converter`](crates/utf8-converter): converts string positions between bytes, chars, UTF-16 code units, and line numbers. Useful when sending string indices across language boundaries.
+- [`string-offsets`](crates/string-offsets): converts string positions between bytes, chars, UTF-16 code units, and line numbers. Useful when sending string indices across language boundaries.
 
 ## Background