docs: add comprehensive changelog and remove codecov badge

Added CHANGELOG.md following Keep a Changelog format to document
version 0.2.0 changes and removed codecov badge from README.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: vtemian

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+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).
+
+## [0.2.0] - 2025-07-02
+
+### Added
+- Comprehensive changelog documentation
+- Modern CI/CD pipeline with GitHub Actions
+- Matrix testing across Python 3.10-3.12 and Django 4.2-5.1
+- Automated PyPI publishing on version tags
+- Security scanning with pip-audit
+- Code quality checks with Ruff (linting and formatting)
+- Package build validation in CI
+- Digital attestations for package security
+
+### Changed
+- **BREAKING**: Minimum Python version increased to 3.10 (from 3.8)
+- **BREAKING**: Minimum Django version increased to 4.2 (from 3.2)
+- Modernized project structure with `pyproject.toml` and `uv` for dependency management
+- Migrated from Travis CI to GitHub Actions
+- Updated django-silk dependency from git+https://github.com/jazzband/django-silk.git to PyPI version (>=5.4.0)
+- Improved development workflow with better dependency resolution
+- Enhanced release process with automated version bumping
+
+### Fixed
+- Resolved CI/CD pipeline failures due to dependency conflicts
+- Fixed PyPI upload restrictions by removing direct git dependencies
+- Corrected GitHub Actions artifact upload/download actions (v3 → v4)
+- Improved version generation for clean releases without dev suffixes
+- Enhanced compatibility with modern Django versions
+
+### Removed
+- Support for Python 3.8 and 3.9
+- Support for Django 3.2, 4.0, and 4.1
+- Travis CI configuration
+- Direct git dependencies that caused PyPI upload failures
+
+## [0.0.3] - Previous Release
+
+### Features
+- Django middleware for Server-Timing header support
+- Thread-local storage for request isolation
+- Timing services and context managers
+- Django-silk integration for SQL query timing
+- Compatible with Django 3.2+ and Python 3.8+
+
+---
+
+**Note**: This changelog was introduced in version 0.2.0. Previous versions may not have detailed change documentation.
+
+For more information about Server-Timing header support, see the [README](README.md).

README.md

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 # django-server-timing
 
 [![CI](https://github.com/vtemian/django-server-timing/actions/workflows/ci.yml/badge.svg)](https://github.com/vtemian/django-server-timing/actions/workflows/ci.yml)
-[![codecov](https://codecov.io/gh/vtemian/django-server-timing/branch/master/graph/badge.svg)](https://codecov.io/gh/vtemian/django-server-timing)
 
 Django middleware that exposed collected metrics into [HTTP Server Timing](https://www.w3.org/TR/server-timing/) header.