Bump Version auf 0.3.0

Neue Features seit 0.2.0:
- CI/CD Pipeline mit automatischen Builds
- Shell-Completions für Bash, Zsh und Fish
- Professionelle Manpage
- Farbige Terminal-Ausgabe
- 13 Integration-Tests

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,34 @@ 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).
 
+## [0.3.0] - 2025-02-10
+
+### Added
+- **CI/CD Pipeline**: Automated testing and release builds via GitHub Actions
+  - CI workflow: Tests on Rust stable and beta, Clippy, rustfmt checks
+  - Release workflow: Multi-platform builds (Linux x86_64, Linux musl, macOS Intel, macOS ARM)
+- **Shell Completions**: Auto-completion support for all major shells
+  - Bash completion (`completions/ntu.bash`)
+  - Zsh completion (`completions/_ntu`)
+  - Fish completion (`completions/ntu.fish`)
+- **Manpage**: Professional manual page (`man/ntu.1`) with full documentation
+- **Colored Output**: Terminal colors for better visual feedback
+  - Green for successful renames
+  - Yellow for dry-run mode
+  - Red for errors
+  - Cyan/bold for statistics
+  - `--no-color` flag to disable colors
+- **Integration Tests**: 13 comprehensive integration tests using `assert_cmd`
+- **README**: Installation instructions for pre-built binaries, badges (CI, Release, Version, License)
+
+### Changed
+- Improved `.gitignore` with better organization
+- Better error messages with colored output
+- Updated test framework to use modern `cargo_bin!` macro
+
+### Fixed
+- Removed unused `warn` import
+
 ## [0.2.0] - 2025-02-10
 
 ### Added