Document recent Rust parser update

Author: Wilfred

CHANGELOG.md

@@ -9,8 +9,8 @@ difftastic now requires Rust 1.75 to build.
 
 ### Parsing
 
-Updated Clojure, Common Lisp and Zig parsers. Improved parsing of
-Kotlin.
+Updated Clojure, Common Lisp, Rust and Zig parsers. Improved parsing
+of Kotlin.
 
 Text encoding detection is now stricter, fixing more cases where
 binary files were treated as text.