Update README.md

Author: marcuspoehls

README.md

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 ## Introduction
-The `@supercharge/arrays` package provides chainable array utilities for Node.js and JavaScript. It’s a wrapper around JavaScript arrays providing useful methods like `.isEmpty()`, `.size()`, `.flatMap()`, `.contains()`, and many more.
+The `@supercharge/arrays` package provides chainable array utilities for Node.js and JavaScript. It’s a wrapper around JavaScript arrays providing useful methods like `.isEmpty()`, `.length()`, `.flatMap()`, `.contains()`, and many more.
 
 
 ## Installation