Update README.md

README.md

@@ -9,16 +9,18 @@
 A simple library that lets you convert webpages or HTML into PDF files using Chromium-powered browsers.
 
 - [snappdf](#snappdf)
- * [Usage](#usage)
- * [Speed](#speed)
- * [Requirements](#requirements)
- * [Installation](#installation)
- + [Downloading local Chromium](#downloading-local-chromium)
- + [Skip the Chromium download](#skip-the-chromium-download)
- + [Headless Chrome doesn't launch on UNIX](#headless-chrome-doesnt-launch-on-unix)
- + [Comparison to Browsershot](#comparison-to-browsershot)
- * [Credits](#credits)
- * [Licence](#licence)
+ - [Usage](#usage)
+ - [Command-line usage:](#command-line-usage)
+ - [Speed](#speed)
+ - [Requirements](#requirements)
+ - [Installation](#installation)
+ - [Downloading local Chromium](#downloading-local-chromium)
+ - [Skip the Chromium download](#skip-the-chromium-download)
+ - [Headless Chrome doesn't launch on UNIX](#headless-chrome-doesnt-launch-on-unix)
+ - [Comparison to Browsershot](#comparison-to-browsershot)
+ - [Delay loading](#delay-loading)
+ - [Credits](#credits)
+ - [Licence](#licence)
 
 ## Usage
 
@@ -180,7 +182,7 @@ OK (1 test, 1 assertion)
 
 ## Requirements
 
-- PHP 7.3+
+- PHP 8
 
 ## Installation