Update RELEASENOTES.md

Author: Kaelig Deloumeau-Prigent

RELEASENOTES.md

@@ -1,5 +1,16 @@
 # Release notes
 
-## Winter ’17
+<!-- Release notes authoring guidelines: http://keepachangelog.com/ -->
 
-- UI Kit created
+<!-- ## [Unreleased] -->
+
+## [1.0.1] - 2016-07-25
+
+- UI Kit updated to say "Winter ’17"
+
+## 1.0.0 - 2016-05-25
+
+- Initial release
+
+[Unreleased]: https://github.com/salesforce-ux/design-system-ui-kit/compare/v1.0.1...HEAD
+[1.0.1]: https://github.com/salesforce-ux/design-system-ui-kit/compare/v1.0.0...v1.0.1