unreleased changelog update

Author: cldougl

CHANGELOG.md

@@ -2,6 +2,15 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## UNRELEASED
+### Updated
+- Upgraded plotly.js to 1.44.3 [#458](https://github.com/plotly/dash-core-components/pull/458)
+  - [Patch release 1.44.3](https://github.com/plotly/plotly.js/releases/tag/v1.44.3) which contains:
+    - Fixed axis `automargin` push offset
+    - Fix handling of alpha channel in rgba coloring in `scatter3d` traces
+    - Fixed subplots with multiple `carpet` traces
+    - Fixed MathJax placement in ternary `aaxis` titles
+
 ## [0.43.0] - 2019-01-25
 ### Added
 - Added event props `n_blur` and `n_clicks` - along with `n_blur_timestamp` and `n_clicks_timestamp` - in `Textarea` components, to maintain the functionality lost by removing the `click` and `blur` events. All other events were already covered by existing props. [#444](https://github.com/plotly/dash-core-components/pull/444)