Changelog for ppad-aead-0.2.0

# Changelog - 0.2.0 (2025-06-21) * The 'encrypt' and 'decrypt' functions are now total, returning 'Left InvalidKey', 'Left InvalidNonce', or 'Left InvalidMAC' values when passed the corresponding bad inputs. - 0.1.0 (2025-03-09) * Initial release, supporting the ChaCha20-Poly1305 configuration.