Merge pull request #10 from urigoren/patch-1

Bug fix

Author: luozhouyang

strsimpy/levenshtein.py

@@ -33,7 +33,7 @@ def distance(self, s0, s1):
         if len(s0) == 0:
             return len(s1)
         if len(s1) == 0:
-            return len(s1)
+            return len(s0)
 
         v0 = [0] * (len(s1) + 1)
         v1 = [0] * (len(s1) + 1)