message: Fix a typo in metadata.py
diff: @@ -355,7 +355,7 @@ class MetadataPopulator(object):
  if f not in recorded_files:
  warnings.warn(
  - "File, '{0}', does not exsit in the metadata. But packing it to "
  + "File, '{0}', does not exist in the metadata. But packing it to "
  "tflite model is still allowed.".format(f))
  def _copy_archived_files(self, src_zip, file_list, dst_zip):
  