message: Fix missing 'break'
diff: @@ -424,7 +424,7 @@ std::string ConvertCase(const std::string &input, Case output_case,
  case Case::kUpperCamel:
  return ConvertCase(CamelToSnake(input), output_case);
  case Case::kDasher: return ConvertCase(DasherToSnake(input), output_case);
  - case Case::kKeep: printf("WARNING: Converting from kKeep case.\n");
  + case Case::kKeep: printf("WARNING: Converting from kKeep case.\n"); break;
  default:
  case Case::kSnake:
  case Case::kScreamingSnake:
  