<commit_before><commit_msg>add changelog [ci skip]<commit_after># 1.4.0

- The pure Ruby version is about 2.5 times faster compared to 1.3.7
- Add `JaroWinkler.jaro_distance` for anyone who want to use jaro distance instead of jaro-winkler distance.
- Unify algorithms between C extensions and pure Ruby, especially, rewrote the pure Ruby version.
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