Add CHANGELOG

CHANGELOG.md

+# paranoia Changelog
+
+## 2.0.4 (2014-12-02)
+
+### Features
+* Add paranoia_scope as named version of default_scope [#184](https://github.com/radar/paranoia/pull/184) ([Jozsef Nyitrai](https://github.com/nyjt))
+
+
+### Bug Fixes
+* Fix initialization problems when missing table or no database connection [#186](https://github.com/radar/paranoia/issues/186)
+* Fix broken restore of has_one associations [#171](https://github.com/radar/paranoia/pull/171) ([Martin Sereinig](https://github.com/srecnig))
+