update log for 4.2.0 release

CHANGELOG.md

@@ -1,5 +1,29 @@
 # Changelog
 
+## 4.2.0 - 2019-08-20
+
+### Added
+- [2787](https://github.com/slimphp/Slim/pull/2787) Add an advanced callable resolver
+- [2791](https://github.com/slimphp/Slim/pull/2791) Add `inferPrivatePropertyTypeFromConstructor` to phpstan
+- [2793](https://github.com/slimphp/Slim/pull/2793) Add ability to configure application via a container in `AppFactory`
+- [2798](https://github.com/slimphp/Slim/pull/2798) Add PSR-7 Agnostic Body Parsing Middleware
+- [2801](https://github.com/slimphp/Slim/pull/2801) Add `setLogErrorRenderer()` method to `ErrorHandler`
+- [2807](https://github.com/slimphp/Slim/pull/2807) Add check for Slim callable notation if no resolver given
+- [2803](https://github.com/slimphp/Slim/pull/2803) Add ability to emit non seekable streams in `ResponseEmitter`
+- [2817](https://github.com/slimphp/Slim/pull/2817) Add the ability to pass in a custom `MiddlewareDispatcherInterface` to the `App`
+
+### Fixed
+- [2789](https://github.com/slimphp/Slim/pull/2789) Fix Cookie header detection in `ResponseEmitter`
+- [2796](https://github.com/slimphp/Slim/pull/2796) Fix http message format
+- [2800](https://github.com/slimphp/Slim/pull/2800) Fix null comparisons more clear in `ErrorHandler`
+- [2802](https://github.com/slimphp/Slim/pull/2802) Fix incorrect search of a header in stack
+- [2806](https://github.com/slimphp/Slim/pull/2806) Simplify `Route::prepare()` method argument preparation
+- [2809](https://github.com/slimphp/Slim/pull/2809) Eliminate a duplicate code via HOF in `MiddlewareDispatcher`
+- [2816](https://github.com/slimphp/Slim/pull/2816) Fix RouteCollectorProxy::redirect() bug
+
+### Removed
+- [2811](https://github.com/slimphp/Slim/pull/2811) Remove `DeferredCallable`
+
 ## 4.1.0 - 2019-08-06
 
 ### Added