More persnickety.

Author: nat-goodspeed

which-branch/which_branch.py

@@ -12,15 +12,16 @@
 
 import contextlib
 import re
-import sys
 import subprocess
+import sys
 
 import github
 
 
 class Error(Exception):
     pass
 
+
 def branches_for(token, commit, repo=None):
     """
     Use the GitHub REST API to discover which branch(es) correspond to the