Initial changelog file

CHANGELOG.md

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+## [2.0.4] - 2017-03-06
+
+### Fixed
+- [#67](https://github.com/librato/statsd-librato-backend/pull/67) Fixed an issue where 4xx errors could potentially crash statsd 
+
+## [2.0.3] - 2017-03-02
+
+### Added
+- [#65](https://github.com/librato/statsd-librato-backend/pull/65) Ability to disable `hostname` tag
+
+### Changed
+- [#66](https://github.com/librato/statsd-librato-backend/pull/66) Better comments / clarification for configuration
+
+## [2.0.2] - 2017-02-10
+
+### Added
+- [#61](https://github.com/librato/statsd-librato-backend/pull/61) Bootstrap script
+
+## [2.0.1] - 2017-02-06
+
+### Changed
+- Minor feedback and improvements for tagging supprort
+
+## [2.0.0] - 2017-01-24
+
+### Added
+- Support for tagged measurements using Librato's new API.
+
+### Deprecated
+- Librato's legacy, source-based API.