message: Add quantization support for Relu6
diff: @@ -191,6 +191,12 @@ OperatorProperty GetOperatorProperty(const BuiltinOperator& op) {
  property.outputs = {{0, {}}};
  property.version = 2;
  break;
  + case BuiltinOperator_RELU6: {
  + property.inputs = {{0, {}}};
  + property.outputs = {{0, {}}};
  + property.version = 2;
  + break;
  + }
  case BuiltinOperator_RESHAPE:
  property.inputs = {{0, {}}};
  property.outputs = {{0, {}}};
  