add Changelog readme

Author: stipsan

CHANGELOG.md

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+# scroll-into-view-if-needed change log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [1.0.4] - 2016-10-31
+### Added
+* Changelog readme.
+* TypeScript definition file (#73 @forabi)
+
+## 1.0.3 - 2016-09-30
+### Documentation
+* link to official ponyfill page (#68 @sindresorhus)
+
+## 1.0.2 - 2016-04-18
+### Added
+* Greenkeeper
+
+### Fixes
+* Incomatibility with default webpack config.
+
+## 1.0.1 - 2016-04-18
+
+* PULLED: accidentally pushed incomplete build to npm!
+
+## 1.0.0 - 2016-04-18
+### Added
+* Initial release.
+
+[1.0.4]: https://github.com/stipsan/scroll-into-view-if-needed/compare/v1.0.3...v1.0.4