chore(CHANGELOG): add next release

CHANGELOG.md

@@ -5,14 +5,30 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+[Unreleased]: https://github.com/steganogram/stegano-rs/compare/v0.5.0...HEAD
+
+## [0.5.0] - 2021-12-09
+### ✨ Features
+- [image color channel step customization](https://github.com/steganogram/stegano-rs/pull/50)
+  introducing a new experimental cli argument `--x-color-step-increment <number>` that allows for custom increments
+  that decide which color channels to take.
+  For example ``--x-color-step-increment 2` would take the 0, the 2nc, the 4th, the 6th and so on color channel 
+  when iterating over pixels. Note that > 4 is the 2nd pixel, > 8 the 3rd pixel and so on.
+
+### Contributors
+- [sassman](https://github.com/sassman)
+
 ## [0.4.10] - 2021-11-15
+[0.4.10]: https://github.com/steganogram/stegano-rs/compare/v0.4.10...v0.4.9
+
 ### 🛠️ Maintenance
 - [chore(deps): bump versions](7f4aba395002a2c5beaba3ba8b58548e4f7c9723)
 
 ### Contributors
 - [sassman](https://github.com/sassman)
 
 ## [0.4.9] - 2021-05-07
+[0.4.9]: https://github.com/steganogram/stegano-rs/compare/v0.4.9...v0.4.8
 ### 🛠️ Maintenance
 - [chore(deps): strip unused deps](https://github.com/steganogram/stegano-rs/pull/35)
 
@@ -133,8 +149,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - Typos in cli output and descriptions
 
-[Unreleased]: https://github.com/steganogram/stegano-rs/compare/v0.4.9...HEAD
-[0.4.9]: https://github.com/steganogram/stegano-rs/compare/v0.4.9...v0.4.8
 [0.4.8]: https://github.com/steganogram/stegano-rs/compare/v0.4.8...v0.4.7
 [0.4.7]: https://github.com/steganogram/stegano-rs/compare/v0.4.7...v0.4.6
 [0.4.6]: https://github.com/steganogram/stegano-rs/compare/v0.4.6...v0.4.5