Fix style

IPython/nbconvert/preprocessors/highlightmagics.py

@@ -21,8 +21,7 b' from __future__ import print_function, absolute_import'
 import re
 
 # Our own imports
-# Needed to override preprocessor
-from .base import (Preprocessor)
+from .base import Preprocessor
 from IPython.utils.traitlets import Dict
 
 #-----------------------------------------------------------------------------