message: Fix quantization debugger's `tf_export`
  This should be usable with TF v2, too.
diff: @@ -44,7 +44,7 @@ def _get_quant_params(
  return None
  -@tf_export.tf_export(v1=['lite.experimental.QuantizationDebugOptions'])
  +@tf_export.tf_export('lite.experimental.QuantizationDebugOptions')
  class QuantizationDebugOptions:
  """Debug options to set up a given QuantizationDebugger."""
  @@ -71,7 +71,7 @@ class QuantizationDebugOptions:
  self.model_debug_metrics = model_debug_metrics
  -@tf_export.tf_export(v1=['lite.experimental.QuantizationDebugger'])
  +@tf_export.tf_export('lite.experimental.QuantizationDebugger')
  class QuantizationDebugger:
  """Debugger for Quantized TensorFlow Lite debug mode models.
  