add CHANGELOG

CHANGELOG.md

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+# CHANGELOG
+
+## 2.0.0
+
+* update gemspec with license info jordimassaguerpla #72
+* fix readme typo jcamenisch #71
+* initialize with merge coerces values mattfawcett #27
+* Hashie::Extensions::Coercion coerce_keys takes arguments mattfawcett #28
+* Trash removes translated values on initialization sleverbor #39
+* Mash#fetch works with symbol or string keys arthwood #66
+* Hashie::Hash inherits from ::Hash to avoid ambiguity meh, orend #49
+* update respond_to? method signature to match ruby core definition dlupu #62
+* DeepMerge extension nashby #41
+* Dash defaults are dup'ed before assigned ohrite #63
+* remove id, type, and object_id as special allowable keys jch #77
+* merge and update accepts a block jch #78