Update code.py

Author: teschlg

kryptools/code.py

@@ -205,7 +205,7 @@ def minimum_distance(self, d_lower = None) -> int:
                         d += 1
                     if d_lower and d <= d_lower:  # known lower bound
                         self.d = d
-                        return d      
+                        return d
                     d_ub = min(d_ub, d)
                     # Gosper's hack
                     c = x & -x