Release 2.7.0

Performance

• improve performance of Levenshtein.distance/Levenshtein.editops for
  long sequences.

Added

• add score_hint parameter to Levenshtein.editops which allows the use of a
  faster implementation

Changed

• all functions in the string_metric module do now raise a deprecation warning.
  They are now only wrappers for their replacement functions, which makes them slower
  when used with the process module