v0.3.0

• New CLI flags: --version, --cdx-component-type
• New Plugins: Annotation for language packages already found by OS package for DPKG, transitive requirements.txt extraction
• Potentially breaking API changes: Moved ToPURL, Ecosystem from Extractor to Package, changed Package.Extractor to Package.Plugins
• Switched to cgo-less SQLite driver to avoid dependency on C code
• Support for Extractors that run on whole directories instead of individual files