add CHANGELOG

Author: etpinard

CHANGELOG.md

@@ -0,0 +1,28 @@
+# plotly.js changelog.
+
+For more context information, please read through the
+[release notes](https://github.com/plotly/plotly.js/releases).
+
+## [1.0.0] -- 2015-11-17
+
+First fully open source release.
+
+### Added
+- Add 2D WebGL plot engine
+
+### Changed
+- Save to cloud is now done via a modebar button by default,
+  the `'Edit chart'` link is still available through the 
+  `'showLink'` plot config.
+- Better double-click notifier CSS
+
+### Fixed
+- Fix `Plotly.newPlot` 3D and geo bug.
+- Fix `plotly_click` event bug in latest Chrome and Firefox.
+
+### Known limitations
+- Different plot types cannot be mixed in subplots.
+- 2D WebGL has no image test support.
+- Click and hover events are not hooked for gl3d, geo and gl2d
+  plot types.
+- Polar chart are under-developed.