added CHANGELOG

Author: afeld

CHANGELOG.md

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+## 1.0.3
+
+[commits](https://github.com/afeld/backbone-nested/compare/v1.0.2...v1.0.3)
+
+* fixed `toJSON()` ([p3drosola](https://github.com/afeld/backbone-nested/pull/9))
+
+## 1.0.2
+
+[commits](https://github.com/afeld/backbone-nested/compare/v1.0.1...v1.0.2)
+
+* added option to silence `get()` warnings for non-leaf attributes
+
+## 1.0.1
+
+[commits](https://github.com/afeld/backbone-nested/compare/v1.0.0...v1.0.1)
+
+* header and documentation fixes
+
+## 1.0.0
+
+Initial release!