v0.2.0

What's Changed

• Add Metadata, Key::metadata(), and KeyRing::metadata()
• Add Links abstraction, and KeyRing::get_links()
• Cleanup docs, rename Key::set_perm, bump version
• Add Eq, PartialEq, Copy, Clone to most relevant public structs

Pull Requests

• Implement KeyRing::get_links by @landhb in #4
• Metadata and Links Additions by @landhb in #5

Full Changelog: v0.1.2...v0.2.0