Dtale

* [659](https://github.com/man-group/dtale/issues/659): editing cells with predefined values
* [692](https://github.com/man-group/dtale/issues/692): updated dash to throw regular exceptions instead of 204s when in Google Colab

* Updated usage to dash_bootstrap_components.Checkbox to be backwards compatible

* [719](https://github.com/man-group/dtale/issues/719): allow NaN values in groupby
* Updated cell editor and header editor to use select dropdown on category columns
* [708](https://github.com/man-group/dtale/issues/708): render boolean column values as checkboxes)

* [709](https://github.com/man-group/dtale/issues/709): added additional VSCode check for VSCODE_INJECTION
* [714](https://github.com/man-group/dtale/issues/714): pushed plotly legend below x-axis labels
* [711](https://github.com/man-group/dtale/issues/711): fix for predefined filters to return numbers to the backend when necessary
* frontend package upgrades:
* upgraded to latest version of react
* dropped enzyme in favor of testing-library/react
* upgraded chart.js

* [703](https://github.com/man-group/dtale/issues/703): fix for matplotlib imports
* [704](https://github.com/man-group/dtale/issues/704): fix for replacing nan with zero
* [677](https://github.com/man-group/dtale/issues/677): include row dropping in history

* Added DESCRIPTION.md to MANIFEST.in