message: Extend the file identifier for metadata schema to 4 letters.
diff: @@ -17,7 +17,7 @@ namespace tflite;
  // WARNING: This file contains experimental interface and is subject to change.
  // This corresponds to the schema version.
  -file_identifier "M0";
  +file_identifier "M000";
  // File extension of any written files.
  file_extension "tflitemeta";
  