add change log

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased][unreleased]
+- No notable updates
+
+## [1.0.0.dev2] - 2015-09-01
+### Added
+- Code coverage via [coveralls]
+- CONTRIBUTING file for notes on how to contribute
+- `Templates` class to manage templates
+- `RecipientLists` class to manage recipients we want to send to
+- `SuppressionLists` class to manage recipients that are suppressed
+
+### Changed
+- Renamed `Transmission` class to `Transmissions` (backwards compatible)
+
+### Removed
+- Tox file for running tests in favor of `make test` and Travis CI
+
+### Fixed
+- Engagement tracking no longer automatically enabled for all transmissions
+- Documentation generation issues
+
+## 1.0.0.dev1 - 2014-02-09
+### Added
+- Base SparkPost class
+- `Transmission` class for sending messages
+- Examples for Transmission usage
+- Metrics class for getting a list of campaigns and domains
+- Docs on readthedocs.org
+
+[unreleased]: https://github.com/sparkpost/python-sparkpost/compare/1.0.0.dev2...HEAD
+[1.0.0.dev2]: https://github.com/sparkpost/python-sparkpost/compare/1.0.0.dev1...1.0.0.dev2
+[coveralls]: https://coveralls.io/github/SparkPost/python-sparkpost
+
+
+Added for new features.
+Changed for changes in existing functionality.
+Deprecated for once-stable features removed in upcoming releases.
+Removed for deprecated features removed in this release.
+Fixed for any bug fixes.
+Security