Update README for v1.3.1 release

- Added license management feature to admin features list
- Updated PHP requirement from 7.4 to 8.3
- Updated file structure version comment to v1.3.1
- Added v1.3.0 and v1.3.1 changelog entries

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -20,10 +20,11 @@ A powerful WooCommerce plugin that adds tier pricing and package pricing functio
 
 ### Admin Features
 - Easy-to-use product meta boxes for adding tiers and packages
-- Global settings page under WooCommerce menu
+- Global settings page under WooCommerce menu with sub-tabs
 - Configure display position (before/after add to cart, after price)
 - Enable/disable tier or package pricing independently
 - Sortable pricing rules
+- License management with secure HMAC signature verification
 
 ### Frontend Features
 - Beautiful pricing tables on product pages
@@ -110,7 +111,7 @@ When editing a product, scroll to the **Product data** panel:
 
 ```
 wc-tier-and-package-prices/
-├── wc-tier-and-package-prices.php    # Main plugin file (v1.1.20)
+├── wc-tier-and-package-prices.php    # Main plugin file (v1.3.1)
 ├── includes/
 │   ├── class-wc-tpp-admin.php        # Admin settings integration
 │   ├── class-wc-tpp-settings.php     # WooCommerce settings page
@@ -149,7 +150,7 @@ wc-tier-and-package-prices/
 
 - WordPress 6.0 or higher (tested up to 6.9.x)
 - WooCommerce 8.0 or higher (tested up to 10.x)
-- PHP 7.4 or higher
+- PHP 8.3 or higher (required since v1.3.0)
 
 ### Compatibility
 
@@ -183,9 +184,32 @@ This plugin is licensed under the GPL v2 or later.
 
 ## Changelog
 
+### Version 1.3.1 - 2026-01-27
+
+__Current Release__ - Secure License Client
+
+- __Changed__: Switched to `SecureLicenseClient` with HMAC-SHA256 response signature verification
+- __New__: Server Secret configuration field for secure communication with license server
+- __New__: Rate limit exception handling with retry time display
+- __New__: Signature verification and URL validation error handling
+- __Security__: Response signatures verified using HMAC-SHA256 with license-specific derived keys
+
+See [CHANGELOG.md](CHANGELOG.md) for complete details.
+
+### Version 1.3.0 - 2026-01-25
+
+__Breaking Changes__ - PHP 8.3+ Required
+
+- __Breaking__: Minimum PHP version increased from 7.4 to 8.3
+- __New__: License management via `magdev/wc-licensed-product-client` library
+- __New__: Settings page split into "General" and "License" sub-tabs
+- __New__: AJAX-based license validation and activation with visual feedback
+- __New__: License status caching with daily auto-refresh
+- __New__: PHP version check with admin notice for incompatible servers
+
 ### Version 1.2.0 - 2025-12-29
 
-__Current Release__ - Variable Product Support
+Variable Product Support
 
 - __New__: Full support for WooCommerce variable products with variation-level pricing
 - __New__: Each variation can have independent tier and package pricing configuration
@@ -194,24 +218,6 @@ __Current Release__ - Variable Product Support
 - __Fixed__: Quantity restrictions now work correctly per-variation
 - 100% backward compatible - no breaking changes
 
-See [CHANGELOG.md](CHANGELOG.md) for complete details.
-
-### Version 1.1.22 - 2025-12-23
-
-- Increased width of label input fields in admin interface
-
-#### Fixed
-- **CRITICAL:** WooCommerce Blocks fatal error in mini-cart and cart blocks
-- Fixed `woocommerce_store_api_product_quantity_editable` filter signature mismatch
-- Filter now correctly accepts `WC_Product` object instead of cart item array
-- Resolves "Cannot use object of type WC_Product_Simple as array" fatal error
-
-#### Technical Details
-- Updated `block_quantity_editable()` method signature to accept product object
-- Changed parameter from `$cart_item` array to `WC_Product $product`
-- Uses `$product->get_id()` instead of array access for product ID
-- Full compatibility with WooCommerce Store API and block-based cart/checkout
-
 ### Recent Major Updates
 
 #### Version 1.1.7 - Enhanced Tier Pricing