message: Fix the wrong ValurError formatting in convolutional.py
diff: @@ -1232,9 +1232,7 @@ class Conv2DTranspose(Conv2D):
  def build(self, input_shape):
  if len(input_shape) != 4:
  - raise ValueError('Inputs should have rank ' +
  - str(4) +
  - 'Received input shape:', str(input_shape))
  + raise ValueError('Inputs should have rank 4. Received input shape: ' + str(input_shape))
  if self.data_format == 'channels_first':
  channel_axis = 1
  else:
  