docs: update for 0.3.0 release

CHANGELOG.md

@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.0] - 2026-04-21
+
+### Added
+- Self-update command to update gitclaw itself (`gitclaw self-update`, `gitclaw self-update --check`)
+- Checksum verification for downloaded assets (`--verify` flag)
+- Parallel install support for multiple packages (`gitclaw install pkg1 pkg2 pkg3`)
+
+### Changed
+- Install command now accepts multiple package arguments
+
 ## [0.2.0] - 2026-04-21
 
 ### Added

README.md

@@ -45,6 +45,12 @@ gitclaw install BurntSushi/ripgrep --force
 
 # Dry run (preview without installing)
 gitclaw install BurntSushi/ripgrep --dry-run
+
+# Verify checksum
+gitclaw install BurntSushi/ripgrep --verify
+
+# Install multiple packages in parallel
+gitclaw install BurntSushi/ripgrep sharkdp/fd ducaale/xh
 ```
 
 ### List installed packages
@@ -83,6 +89,16 @@ gitclaw completions zsh > /usr/local/share/zsh/site-functions/_gitclaw
 gitclaw completions fish > ~/.config/fish/completions/gitclaw.fish
 ```
 
+### Update gitclaw itself
+
+```bash
+# Check for updates
+gitclaw self-update --check
+
+# Update to latest version
+gitclaw self-update
+```
+
 ### Search for releases
 
 ```bash