Update CHANGELOG

CHANGELOG.md

@@ -6,17 +6,34 @@ The format is based on [Keep a Changelog],
 and this project adheres to [Semantic Versioning].
 
 
+## [0.4.0] - unreleased
+
+### Added
+
+- Added the `as_bytes()` casting helper.
+  [[#106](https://github.com/chfast/intx/pull/106)]
+
+### Changed
+
+- The endian-specific API for converting intx types to/from bytes has been reworked.
+  [[#107](https://github.com/chfast/intx/pull/107)]
+
+
 ## [0.3.0] - 2019-06-20
+
 ### Added
-- New `addmod()` and `mulmod()` procedures have been added for the `uint256` type 
-  ([#101](https://github.com/chfast/intx/pull/101)).
+- New `addmod()` and `mulmod()` procedures have been added for the `uint256` type. 
+  [[#101](https://github.com/chfast/intx/pull/101)]
+
 ### Changed
-- Pedantic compiler warnings have been fixed 
-  ([#98](https://github.com/chfast/intx/pull/98)).
+- Pedantic compiler warnings have been fixed.
+  [[#98](https://github.com/chfast/intx/pull/98)]
 - Performance of the division algorithm increased up to 40% 
-  when dividing 256-bit values by 128-bit and 64-bit ones 
-  ([#99](https://github.com/chfast/intx/pull/99)).
+  when dividing 256-bit values by 128-bit and 64-bit ones.
+  [[#99](https://github.com/chfast/intx/pull/99)]
+
 
+[0.4.0]: https://github.com/chfast/intx/compare/v0.3.0...master
 [0.3.0]: https://github.com/chfast/intx/releases/v0.2.0
 
 [Keep a Changelog]: https://keepachangelog.com/en/1.0.0/