Add changelog

CHANGELOG.md

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+# Changelog
+
+## v1.0.0-beta.2 - 2017-10-10
+
+### Added
+
+- Code of Conduct
+- Contribution guidelines
+- Documentation on `appendTo` option for `Draggable`
+- Added concept of `originalSource`
+- Fix for text selection issue
+- Fix for native drag events firing for the `MouseSensor`
+- Fix for missing `classes` option
+
+### Changes
+
+- README updates
+- Touch improvements
+- ForceTouchSensor is not included by default anymore
+- Folder/File restructure
+- Exports `AbstractEvent` as `BaseEvent`
+- Update node version from `8.2.1` to `8.6.0`
+- Clones event callbacks before triggering (to prevent mutation during iterations)
+- Improvements to `closest` utils helper
+
+## v1.0.0-beta - 2017-09-27
+
+Initial release