Dtale

* [591](https://github.com/man-group/dtale/issues/591): load parquet from UI
* [590](https://github.com/man-group/dtale/issues/590): parquet export
* [533](https://github.com/man-group/dtale/issues/533): Time Series Analysis
* [537](https://github.com/man-group/dtale/issues/537): moved "Resample" to the "Dataframe Functions" popup]

* [583](https://github.com/man-group/dtale/issues/583): allow for "vertical_headers" to be set from dtale.show

* [581](https://github.com/man-group/dtale/issues/581): Binder proxy handling updates
* [583](https://github.com/man-group/dtale/issues/583): vertical column headers
* front-end package upgrades

* updated dash-bio to an optional dependency

* fix for `background_mode` in `dtale.show`

* re-pinned dash to 2.0.0