Revert "Delete changelog file"

This reverts commit c52f6c908525e644b2743209d049e951af863498.

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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][] and this project adheres to
+[Semantic Versioning][].
+
+[Keep a Changelog]: http://keepachangelog.com/
+[Semantic Versioning]: http://semver.org/
+
+## Unreleased
+
+## 0.3.1 - 2018-10-16
+### Fixed
+- Branching part.
+
+## 0.3.0 - 2018-10-12
+### Added
+- Git commit message heuristics.
+- Collaboration section to remote part.
+
+### Changed
+- Branching part.
+- Moved testing files to `playground` folder.
+
+## 0.2.0 - 2018-10-10
+### Added
+- Introduction moved to separate file.
+
+### Changed
+- Sections extended.
+
+## 0.1.0 - 2018-06-28
+### Added
+- Changelog, license, readme.
+- Git basics.
+- Remote docs.
+- Branching docs.
+- OneFlow docs.