changelog for new hljs langs

Author: alexcjohnson

CHANGELOG.md

@@ -14,6 +14,16 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - [#1679](https://github.com/plotly/dash/pull/1679) Restructure `dash`, `dash-core-components`, `dash-html-components`, and `dash-table` into a singular monorepo and move component packages into `dash`. This change makes the component modules available for import within the `dash` namespace, and simplifies the import pattern for a Dash app. From a development standpoint, all future changes to component modules will be made within the `components` directory, and relevant packages updated with the `dash-update-components` CLI command.
 - [#1707](https://github.com/plotly/dash/pull/1707) Change the default value of the `compress` argument to the `dash.Dash` constructor to `False`. This change reduces CPU usage, and was made in recognition of the fact that many deployment platforms (e.g. Dash Enterprise) already apply their own compression. If deploying to an environment that does not already provide compression, the Dash 1 behavior may be restored by adding `compress=True` to the `dash.Dash` constructor.
 
+## Dash Core Components
+### Added
+
+- [#1729](https://github.com/plotly/dash/pull/1729) Include F#, C#, and MATLAB in markdown code highlighting, for the upcoming .NET and MATLAB flavors of dash.
+
+## Dash Table
+### Added
+
+- [#1729](https://github.com/plotly/dash/pull/1729) Include F#, C#, and MATLAB in markdown code highlighting, for the upcoming .NET and MATLAB flavors of dash.
+
 ## [1.21.0] - 2021-07-09
 
 ## Dash and Dash Renderer