Adding CHANGELOG

Author: durran

CHANGELOG.md

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+# 2.0.1
+
+## Bug Fixes
+
+* [RUBY-882](https://jira.mongodb.org/browse/RUBY-882): Documents now properly generate missing ids on insert.
+
+# 2.0.0
+
+2.0.0 is a rewrite and a backwards incompatible release. Please see the [documentation](http://docs.mongodb.org/ecosystem/tutorial/ruby-driver-tutorial/#ruby-driver-tutorial) for the new API.