update changelog

ChosunOne · Mar 3, 2019 · 6c06f95 · 6c06f95
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+# 2.0.2
+* Minor internal optimization
 # 2.0.0
 * Separate serde from ```default_tree``` feature, now use ```use_serde``` to take advantage of 
 serde for serialization, though a number of serde schemes are implemented as their own features (see below).