message: Update README.md
  Better to understand. Also that it is similar to the helloworld examples.
diff: @@ -76,7 +76,7 @@ AEAD primitive in Java:
  Aead aead = AeadFactory.getPrimitive(keysetHandle);
  // 3. Use the primitive.
  - byte[] ciphertext = aead.encrypt(plaintext, aad);
  + byte[] ciphertext = aead.encrypt(plaintext, new byte[0] /* additionalData */);
  ```
  ## Current Status
  