docs: prepare v0.6.0

Author: Rogdham

CHANGELOG.md

@@ -5,9 +5,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/), and this project
 adheres to [Semantic Versioning](https://semver.org/).
 
-## [Unreleased]
+## [0.6.0] - 2025-10-18
 
-[unreleased]: https://github.com/rogdham/python-xz/compare/v0.5.0...HEAD
+[0.6.0]: https://github.com/rogdham/python-xz/releases/tag/v0.6.0
 
 ### :boom: Breaking changes
 

README.md

@@ -37,11 +37,11 @@ would read all previous blocks for nothing).
 |   📝 **write**    |                   |                      |                      |
 |     `w` mode      |      ✔️ yes       |        ✔️ yes        |        ✔️ yes        |
 |     `x` mode      |      ✔️ yes       |        ❌ no         |        ✔️ yes        |
-|     `a` mode      |   ✔️ new stream   |    ✔️ new stream     |      ⏳ planned      |
+|     `a` mode      |   ✔️ new stream   |    ✔️ new stream     |        ❌ no         |
 | `r+`/`w+`/… modes |       ❌ no       |        ❌ no         |        ✔️ yes        |
 |  several blocks   |       ❌ no       |        ❌ no         |        ✔️ yes        |
 |  several streams  | ❌ no<sup>6</sup> |  ❌ no<sup>6</sup>   |        ✔️ yes        |
-|  stream padding   |       ❌ no       |        ❌ no         |      ⏳ planned      |
+|  stream padding   |       ❌ no       |        ❌ no         |        ❌ no         |
 
 </div>