Update README updating deepClone function to include case where arrays inside objects were being converted to plain objects during cloning

[div360]

The Problem

When object[key] is an array, typeof object[key] returns 'object' — so it goes into the recursive branch and calls deepClone(array).

Inside deepClone, a fresh {} (plain object) is created, and then for...in loops over the array's numeric indices as keys.

Added a fix to check if it's an array before creating the clone container:
var newObject = Array.isArray(object) ? [] : {};

Without Array.isArray() check, [1, 2, 3] was silently cloned as { "0": 1, "1": 2, "2": 3 } since both arrays and objects return "object" for typeof,fixed by initializing newObject as [] when the input is an array