docs: update changelog

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 0.8.0 (TBD)
 
 * Implemented the `PartialMmr` data structure (#195).
+* Implemented RPX hash function (#201).
 
 ## 0.7.1 (2023-10-10)
 

README.md

@@ -6,6 +6,7 @@ This crate contains cryptographic primitives used in Polygon Miden.
 
 * [BLAKE3](https://github.com/BLAKE3-team/BLAKE3) hash function with 256-bit, 192-bit, or 160-bit output. The 192-bit and 160-bit outputs are obtained by truncating the 256-bit output of the standard BLAKE3.
 * [RPO](https://eprint.iacr.org/2022/1577) hash function with 256-bit output. This hash function is an algebraic hash function suitable for recursive STARKs.
+* [RPX](https://eprint.iacr.org/2023/1045) hash function with 256-bit output. Similar to RPO, this hash function is suitable for recursive STARKs but it is about 2x faster as compared to RPO.
 
 For performance benchmarks of these hash functions and their comparison to other popular hash functions please see [here](./benches/).