Update readme and changelog for v2.5

Author: samnabi

changelog.md

@@ -1,5 +1,16 @@
 # Changelog
 
+## v2.5
+- Update Kirby and Panel to 2.5.12 (PHP 5.6+ now required)
+- Improve shadow & overlay display in IE (for category tiles)
+- Bug fixes
+    - Fix errors in shipping calculations for products with custom shipping rules
+    - Remember user's selection for custom shipping options in the cart
+    - Fix undefined `$timestamp` error when a downloadable product is not the first to be added to the cart
+    - Fix hidden submit button on payment form when mailing address is hidden
+    - Use Kirby `download()` function instead of manually setting headers for downloadable products
+    - Fix false positive in `appliesToCountry()`
+
 ## v2.4
 - Update Kirby and Panel to 2.5.10
 - Update dompdf to v0.6.1-446-g501ff6d

readme.md

@@ -64,18 +64,20 @@ Use these terminal commands to update Shopkit and its dependencies:
 
 ## Dependencies
 
-An Apache or Nginx server running PHP 5.4+. Your PHP configuration must have the following extensions (most servers do):
+An Apache or Nginx server running PHP 5.6+. Your PHP configuration must have the following extensions (most servers do):
 
 - curl
 - json
 - mbstring
 - dom
 - gd
 
+You must also be able to send mail through PHP's `mail()` function.
+
 Shopkit also depends on these submodules:
 
-- Kirby Core [2.5.10](https://github.com/getkirby/kirby)
-- Kirby Panel [2.5.10](https://github.com/getkirby/panel)
+- Kirby Core [2.5.12](https://github.com/getkirby/kirby)
+- Kirby Panel [2.5.12](https://github.com/getkirby/panel)
 - Stripe PHP SDK [v5.1.1](https://github.com/stripe/stripe-php)
 - Square Connect SDK [2.0.2](https://github.com/square/connect-php-sdk)
 - Multiselect field [2.1.1](https://github.com/distantnative/field-multiselect)