Prepare changelog for v1.8.4

Author: paulbalandan

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to this library will be documented in this file.
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [v1.8.4](https://github.com/CodeIgniter/coding-standard/compare/v1.8.3...v1.8.4) - 2025-02-23
+
+- Update badges
+- Enable `php_unit_data_provider_method_order` fixer
+- Bump php-cs-fixer to v3.70
+- Enable `modernize_stripos` option in `modernize_strpos` fixer
+
 ## [v1.8.3](https://github.com/CodeIgniter/coding-standard/compare/v1.8.2...v1.8.3) - 2025-01-13
 
 - Bump to php-cs-fixer v3.67 and cs-config v3.25