v3.0.0

Changed

• Breaking: require PHP >= 8.1
• Breaking: change namespace from ShoppingCart to Lombervid\ShoppingCart
• Change license from GPL to MIT

Added

• Add CHANGELOG file
• Add composer support
• Add unit tests
• Add support to access item's properties/fields with $item->property syntax
• Add support for default value on Item::get() method

Removed

• Breaking: remove coupon property
• Breaking: remove SymfonySessionStorage storage