message: Update version for MUL.
diff: @@ -234,7 +234,8 @@ BuiltinOpResolver::BuiltinOpResolver() {
  AddBuiltin(BuiltinOperator_BATCH_TO_SPACE_ND, Register_BATCH_TO_SPACE_ND(),
  /* min_version */ 1,
  /* max_version */ 2);
  - AddBuiltin(BuiltinOperator_MUL, Register_MUL());
  + AddBuiltin(BuiltinOperator_MUL, Register_MUL(), /* min_version */ 1,
  + /* max_version */ 2);
  AddBuiltin(BuiltinOperator_L2_NORMALIZATION, Register_L2_NORMALIZATION(),
  /* min_version */ 1,
  /* max_version */ 2);
  