docs: minor [skip ci]

Author: adhocore

README.md

@@ -26,7 +26,7 @@ Framework agnostic Command Line Interface utilities and helpers for PHP. Build C
 
 **Core:** [Argv parser](#argv-parser) · [Cli application](#console-app) · [Shell](#shell)
 
-**IO:** [Colorizer](#color) · [Cursor manipulator](#cursor) · [Stream writer](#writer) · [Stream reader](#reader)
+**IO:** [Colorizer](#color) · [Cursor manipulator](#cursor) · [Progress bar](#progress-bar) · [Stream writer](#writer) · [Stream reader](#reader)
 
 **Other:** [Autocompletion](#autocompletion)