Track 2aterfall chart addition

Author: kMutagene

RELEASE_NOTES.md

@@ -2,16 +2,17 @@
  * [Add Rangesliders for linear Axis](https://github.com/muehlhaus/FSharp.Plotly/commit/544641492195b1938697721b72814e0187a6c979)
  * [Improve jupyter notebook integration](https://github.com/muehlhaus/FSharp.Plotly/commit/e9560656bbc8dbf767c9eb6ca35f321c98195238)
  * [Updated Violin Chart](https://github.com/muehlhaus/FSharp.Plotly/commit/4d3afc527b11cd2f5a18c1d9876ad4e3f83beb02)
+ * Add Chart.withColorBar and Chart.withColorBarStyle to change the appearance of colorbars
+ * [Add Stackgroup related parameters to all charts derived from the scatter trace]()
  * [Refactor Chart.Stack]():
    * new Charts: 
      * Chart.Grid: Uses the grid object of plotly.js to generate various types of subplot grids
      * Chart.SingleStack: Basically Chart.Grid with one Column
- * Add Chart.withColorBar and Chart.withColorBarStyle to change the appearance of colorbars
  * [Add Sunburst Chart]()
  * [Add Treemap Chart]()
  * [Add OHLC Chart]()
  * [Add option to render all charts derived from the scatter trace type via WebGL as scattergl trace]()
- * [Add Stackgroup related parameters to all charts derived from the scatter trace]()
+ * [Add Waterfall Chart]()
 
 ### 1.2.2 - Apr 9 2020
  * [Opening Charts is now more or less OS agnostic](https://github.com/muehlhaus/FSharp.Plotly/commit/f6e3dceade085e43e7e56b478b9cf7b533a4fe55)