docs: prepare v0.3.0

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]
+## [0.3.0] - 2021-11-07
 
-[unreleased]: https://github.com/rogdham/python-xz/compare/v0.2.0...HEAD
+[0.3.0]: https://github.com/rogdham/python-xz/releases/tag/v0.3.0
 
 ### :boom: Breaking changes
 

README.md

@@ -6,7 +6,11 @@ Pure Python implementation of the XZ file format with random access support
 
 _Leveraging the lzma module for fast (de)compression_
 
-[![GitHub build status](https://img.shields.io/github/workflow/status/rogdham/python-xz/build/master)](https://github.com/rogdham/python-xz/actions?query=branch:master) [![Release on PyPI](https://img.shields.io/pypi/v/python-xz)](https://pypi.org/project/python-xz/) [![Code coverage](https://img.shields.io/badge/coverage-100%25-brightgreen)](https://github.com/rogdham/python-xz/search?q=fail+under&type=Code) [![Mypy type checker](https://img.shields.io/badge/type_checker-mypy-informational)](https://mypy.readthedocs.io/) [![MIT License](https://img.shields.io/pypi/l/python-xz)](https://github.com/Rogdham/python-xz/blob/master/LICENSE.txt)
+[![GitHub build status](https://img.shields.io/github/workflow/status/rogdham/python-xz/build/master)](https://github.com/rogdham/python-xz/actions?query=branch:master)
+[![Release on PyPI](https://img.shields.io/pypi/v/python-xz)](https://pypi.org/project/python-xz/)
+[![Code coverage](https://img.shields.io/badge/coverage-100%25-brightgreen)](https://github.com/rogdham/python-xz/search?q=fail+under&type=Code)
+[![Mypy type checker](https://img.shields.io/badge/type_checker-mypy-informational)](https://mypy.readthedocs.io/)
+[![MIT License](https://img.shields.io/pypi/l/python-xz)](https://github.com/Rogdham/python-xz/blob/master/LICENSE.txt)
 
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