Update erect-the-fence.py

Author: kamyu104

Python/erect-the-fence.py

@@ -18,7 +18,7 @@ def ccw(A, B, C):
         points.sort()
         for i in itertools.chain(xrange(len(points)), reversed(xrange(len(points)))):
             while len(hull) >= 2 and \
-                  ccw(hull[-2], hull[-1],  points[i]) < 0:
+                  ccw(hull[-2], hull[-1], points[i]) < 0:
                 hull.pop()
             hull.append(points[i])
         return list(set(map(tuple, hull)))