Update readme.md

Author: jessuppi

readme.md

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 # Secure File Access
 
 Easy file downloads for WordPress
+
+## Changelog
+
+### 1.0.0
+- supports shortcode `[file_access]` for secure file download links with role and WooCommerce subscription-based access control
+- creates admin settings page under Options with tabbed navigation for Access Defaults and Error Messages
+- integrated optional WooCommerce Subscriptions check for active subscription based file access
+- administrators always have access to files displayed on the frontend
+- default roles and WooCommerce subscription settings are blank
+- default label for file download buttons is "Download File"
+- supports customizable error messages for “no access”, “invalid URL”, and “not logged in” states
+- supports localization/translation
+- supports Git Updater
+- supports PHP 7.0 to 8.3
+- supports Multisite