Update changelog.mdx

pages/docs/changelog.mdx

@@ -8,14 +8,39 @@ Below are the changelogs for all FOSSBilling releases ordered most recent to old
 
 Dates are displayed as `MM-DD-YYYY`.
 
+## 0.6.15 (2-18-2024)
+
+For those of you who are upgrading from versions older than 0.6.0, please check [the changelog](https://fossbilling.org/docs/changelog#060-12-11-2023) for that release as well as it included some major changes, including backwards-incompatible ones.
+
+### 🐛 Bug Fixes
+
+- Added missing TLD validation for the when a client attempts to bring their own domain.
+- Fixed the Resellerclub registrar integration.
+- Fixed a mistake which resulted in the throw away domain check duplicating a cache key used for the central alerts system.
+- Fixed the implementation of `findAll` in the `Box_Database` class.
+- Enabled the WYIWYG editor on the new KB article page.
+- The SSL redirect will be skipped if it's missing required data, preventing PHP errors.
+- Fixed a mistake which resulted in search fields in the administrator panel being untranslated.
+
+### 📈 Enhancements
+
+- Refactored the password generation function.
+- Errors when attempting to write the rotating logs will be silently caught and instead forwarded to the `php_error.log` file.
+- Removed some unused dependencies, stopped loading an unused twig extension.
+  - If you had a custom template that was applying translations like so: `{% trans %}Search:{% endtrans %}`, this will now produce a fatal error. To be clear: this never worked to begin with.
+
+### ➕New Features
+
+- You may now configure the maximum age retention for activity logs in the DB. The default will be set to 90 days.
+
 ## 0.6.14 (2-9-2024)
 
 For those of you who are upgrading from versions older than 0.6.0, please check [the changelog](https://fossbilling.org/docs/changelog#060-12-11-2023) for that release as well as it included some major changes, including backwards-incompatible ones.
 
 ### 🐛 Bug Fixes
 
 - Replaced the hard-coded TLDs in the embed module with ones that are queried via the API. It should now only display TLDs you are selling.
-- Fixed  the `Server_Account::getUsername(): Return value must be of type string, null returned` error.
+- Fixed the `Server_Account::getUsername(): Return value must be of type string, null returned` error.
 - Resolved various PHP deprecation errors.
 
 ### 📈 Enhancements