Release 2.13.2

Fixed

• fix incorrect results in Hamming.normalized_similarity
• fix incorrect score_cutoff handling in pure python implementation of
  Postfix.normalized_distance and Prefix.normalized_distance
• fix Levenshtein.normalized_similarity and Levenshtein.normalized_distance
  when used in combination with the process module
• fuzz.partial_ratio was not always symmetric when len(s1) == len(s2)