Removing unused import and fixing indentation issue

skimage/feature/_brief.py

@@ -1,7 +1,6 @@
 import numpy as np
 from scipy.ndimage.filters import gaussian_filter
 
-from ..color import rgb2gray
 from ..util import img_as_float
 from .util import _remove_border_keypoints
 

skimage/feature/util.py

@@ -3,8 +3,7 @@ from scipy.spatial.distance import hamming
 
 
 def _remove_border_keypoints(image, keypoints, dist):
-	"""Removes keypoints that are within dist pixels from the image border.
-	"""
+    """Removes keypoints that are within dist pixels from the image border."""
     width = image.shape[0]
     height = image.shape[1]