add changelog [ci skip]

tonytonyjan · Dec 12, 2015 · de15eba · de15eba
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+# 1.4.0
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+- 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.