docs: Correct spelling error in method name

The commit fixes a spelling error in the method name "proporcional" to "proportional" in the readme.md file. This ensures consistency and readability in the codebase.🔧

Author: vaened

readme.md

@@ -3,14 +3,16 @@
 [![Build Status](https://github.com/vaened/swift-cart/actions/workflows/tests.yml/badge.svg)](https://github.com/vaened/swift-cart/actions?query=workflow:Tests)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](license)
 
-This library is a powerful tool that allows you to efficiently manage purchases, quotes, accounts, and more. With this library, you can effortlessly handle various aspects of a shopping cart, including adding products, taxes, fees, and discounts, and obtaining a detailed summary of the total amount to pay.
+This library is a powerful tool that allows you to efficiently manage purchases, quotes, accounts, and more. With this library, you can
+effortlessly handle various aspects of a shopping cart, including adding products, taxes, fees, and discounts, and obtaining a detailed
+summary of the total amount to pay.
 
 > This library is based on [vaened/php-price-engine](https://github.com/vaened/php-price-engine) for price management
 
 ```php
 // initialize cart
 $taxes = Taxes::from([
-    Inclusive::proporcional(18, 'IGV')
+    Inclusive::proportional(18, 'IGV')
 ]);
 
 $cart = new ShoppingCart($taxes);
@@ -20,11 +22,11 @@ $mouse = $cart->push(Product::findOrFail(1), quantity: 2);
 
 // assign individual charges and discounts
 $mouse->add(
-    Charge::proporcional(percentage: 5)->named('Delivery'),
+    Charge::proportional(percentage: 5)->named('Delivery'),
     Charge::fixed(amount: 2)->named('Random'),
 );
 $mouse->apply(
-    Discount::proporcional(percentage: 10)->named('NewUser')
+    Discount::proportional(percentage: 10)->named('NewUser')
 );
 
 // update quantity
@@ -35,12 +37,13 @@ $cart->addAsGlobal(
     Charge::fixed(amount: 2)->named('Express')
 );
 $cart->applyAsGlobal(
-    Discount::proporcional(percentage: 1)
+    Discount::proportional(percentage: 1)
 );
 
 // get summary
 $cart->summary();
 ```
+
 ## Installation
 
 You can install the library using `composer`.