Update changelog.

Author: mattstein

CHANGELOG.md

@@ -1,5 +1,25 @@
 # Unsend PHP Library Release Notes
 
+## [Unreleased]
+
+### Added
+
+- `Unsend::create(apiKey, baseUrl?, options?)` factory for simpler initialization
+- `iterateEmails(array $parameters = [])` for seamless pagination
+- Unified `ApiException` for non-2xx responses with parsed message/status
+- PHPStan configuration and stricter array-shape PHPDocs
+
+### Changed
+
+- HTTP client defaults: timeouts, connect timeout, `Accept`, and `User-Agent`
+- Only send `Content-Type: application/json` when a JSON body is present
+- `Response` now tolerates empty bodies without throwing
+- README updated for factory usage, iteration, and error behavior
+- Tests updated to assert `ApiException`
+- Composer metadata updated: require `ext-json`; add PHPStan to dev dependencies
+
+[1.1.0]: https://github.com/mattstein/unsend-php/compare/v1.0.0...v1.1.0
+
 ## 1.0.0 - 2025-08-06
 
 Initial release.