Update changelog

Author: jrfnl

README.md

@@ -89,17 +89,18 @@ All code within the PHPCompatibility organisation is released under the GNU Less
 
 ## Changelog
 
-### 2.0.0 - 2025-xx-xx
+### 2.0.0-alpha1 - 2025-xx-xx
 
-* Composer: The PHPCompatibility dependency has been updated to the recently released new major version.
-    Note: in rare cases, this means that custom `<exclude>` rules in a project's `[.]phpcs.xml[.dist]` configuration file may needs to be updated.
+* Composer: The PHPCompatibility dependency has been updated to the recently released 10.0.0-alpha1 version.
+    Note: in select cases, this means that custom `<exclude>` rules in a project's `[.]phpcs.xml[.dist]` configuration file may needs to be updated.
     Along the same lines, selective `// phpcs:ignore` comments used inline may need to be updated with the new sniff code(s).
-    For full information on these kind of changes, please refer to the [changelog for PHPCompatibility 10.0.0](https://github.com/PHPCompatibility/PHPCompatibility/releases/tag/10.0.0).
+    For full information on these kind of changes, please refer to the [Upgrade guide for PHPCompatibility 10.0.0](https://github.com/PHPCompatibility/PHPCompatibility/wiki/Upgrading-to-PHPCompatibility-10.0).
 * The [Composer PHPCS plugin] will now be installed automatically to register PHPCompatibility and other external standards with PHP_CodeSniffer.
     If you have a `require-dev` in place for this plugin in your own `composer.json`, it is strongly recommended to remove this to prevent conflicting version constraints.
-    If you previously used another Composer plugin or manually set the `installed_paths` configuration, it is recommended you remove this in favour of letting the [Composer PHPCS plugin] handle this.
+    If you previously used another Composer plugin, manually set the `installed_paths` configuration, or set the `installed_paths` in your `[.]phpcs.xml[.dist]` configuration file, it is recommended you remove this in favour of letting the [Composer PHPCS plugin] handle this.
 * Support for PHP 5.3 has been dropped. The new minimum supported PHP version is 5.4.
-* Support for PHP_CodeSniffer < 3.11.0 has been dropped.
+* Support for PHP_CodeSniffer 4.0 has been added.
+* Support for PHP_CodeSniffer < 3.13.3 has been dropped.
 
 ### 1.0.6 - 2025-10-18