message: Add missing newline in diagnostic.
diff: @@ -187,7 +187,7 @@ int main(int argc, char** argv) {
  std::cout << content;
  }
  // Print the error message last so it shows up in user's console.
  - std::cerr << format_status.message();
  + std::cerr << format_status.message() << std::endl;
  switch (format_status.code()) {
  case StatusCode::kCancelled:
  case StatusCode::kInvalidArgument:
  