message: Update crypto README.md
diff: @@ -12,6 +12,8 @@ and [cosmwasm-std](`https://crates.io/crates/cosmwasm-std`) crates.
  scheme, for Cosmos signature / public key formats.
  - `ed25519_verify()`: Digital signature verification using the EdDSA ed25519
  scheme, for Tendemint signature / public key formats.
  +- `ed25519_batch_verify()`: Batch digital signature verification using the EdDSA
  + ed25519 scheme, for Tendemint signature / public key formats.
  ## License
  