Add Changelog

Changelog.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.3.0] - 2017-09-14
+
+### Added
+
+ * Packaging binaries
+ * [Published on pypi](https://pypi.org/project/pyo3-pack/). You can now `pip install pyo3-pack`
+ * A Dockerfile based on manylinux1
+
+### Fixed
+
+ * Travis ci setup builds all types of wheels for linux and mac
+ * `--no-default-features --features auditwheel` creates a manylinux compliant binary for pyo3-pack
+
+### Changed
+
+ * Replaced elfkit with goblin
+
+## [0.2.0] - 2018-09-03
+
+### Added
+
+ * Cffi support
+ * A `develop` subcommand
+ * A tox example
+
+### Changed
+
+ * Show a progress bar for cargo's compile progress
+
+## 0.1.0 - 2018-08-22
+
+ * Initial Release
+
+[Unreleased]: https://github.com/pyo3/pyo3-pack/compare/v1.0.0...HEAD
+[0.3.0]: https://github.com/pyo3/pyo3-pack/compare/v0.2.0...v0.3.0
+[0.2.0]: https://github.com/pyo3/pyo3-pack/compare/v0.1.0...v0.2.0
+
+