message: Rename additionalData to associatedData.
  Also, fix a lint warning at the same time.
diff: @@ -80,12 +80,9 @@ public final class Commands {
  Aead aead = handle.getPrimitive(Aead.class);
  // 3. Do crypto. It's that simple!
  byte[] plaintext = Files.readAllBytes(inFile.toPath());
  - byte[] ciphertext = aead.encrypt(plaintext, new byte[0] /* additionalData */);
  - FileOutputStream stream = new FileOutputStream(outFile);
  - try {
  + byte[] ciphertext = aead.encrypt(plaintext, new byte[0] /* associatedData */);
  + try (FileOutputStream stream = new FileOutputStream(outFile)) {
  stream.write(ciphertext);
  - } finally {
  - stream.close();
  }
  }
  }
  @@ -99,12 +96,9 @@ public final class Commands {
  KeysetHandle handle = getKeysetHandle(keyset);
  Aead aead = handle.getPrimitive(Aead.class);
  byte[] ciphertext = Files.readAllBytes(inFile.toPath());
  - byte[] plaintext = aead.decrypt(ciphertext, new byte[0] /* additionalData */);
  - FileOutputStream stream = new FileOutputStream(outFile);
  - try {
  + byte[] plaintext = aead.decrypt(ciphertext, new byte[0] /* associatedData */);
  + try (FileOutputStream stream = new FileOutputStream(outFile)) {
  stream.write(plaintext);
  - } finally {
  - stream.close();
  }
  }
  }
  