README update

Author: hipertracker

README.md

@@ -15,7 +15,7 @@ Tested on 123 files (504MB)
 
 Results:
 
-1. Rust 1.58.1 -> 0.3521 s
+1. Rust with waitgroup 1.58.1 -> 0.3521 s
 2. Ruby 3.1 with Parallel -> 2.0542 s
 3. Python 3.10.2 with multiprocessing -> 2.9403 s
 4. Crystal 1.3.2 with channels ->  6.0035 s