v3.1.1

• Add deriveAddress(<address>, '/<soft>/<soft-b>') via sr25519 soft
• Use scrypt from WASM as available (JS fallback in place)
• Add base32{Encode, Decode} utilities (IPFS-compatible alphabet)
• Support IPFS compatibility flag in base58 encoding/decoding
• Update to @polkadot/wasm-crypto 1.3.1