Fix anchor link

Author: pH-7

README.md

@@ -2,7 +2,7 @@
 
 **Simple PHP package to easily send the right HTTP header responses to the browser 🐘**
 
-- [⚙️ Requirement](##requirement)
+- [⚙️ Requirement](#requirement)
 - [📦 Installation](#installation)
 - [🪄 Examples](#-usage---examples)
 - [👨‍🍳 Who is the baker?](#-who-baked-this)