Dash-html-components

As of Dash 2, the development of dash-html-components has been moved to the [main Dash repo](https://github.com/plotly/dash)

This package exists for backward compatibility

Changed
- [194](https://github.com/plotly/dash-html-components/pull/194) Updated dependencies and build process
- [190](https://github.com/plotly/dash-core-components/pull/190) Updated R package vignettes and `dash-info.yaml` to regenerate examples without attaching now-deprecated core component packages (`dashHtmlComponents`, `dashCoreComponents`, or `dashTable`).

Fixed
- [179](https://github.com/plotly/dash-html-components/pull/179) - Fixes [#77](https://github.com/plotly/dash-html-components/issues/77) Added `allow` and `referrerPolicy` properties to `html.Iframe`

- [178](https://github.com/plotly/dash-html-components/pull/178) - Fix [#161](https://github.com/plotly/dash-html-components/issues/161) <object> `data` property, and fix [#129](https://github.com/plotly/dash-html-components/issues/129) obsolete, deprecated, and discouraged elements. No elements were removed, but comments were added to the documentation about these elements detailing their limitations.

Fixed
- [169](https://github.com/plotly/dash-html-components/pull/169) - part of fixing dash import bug https://github.com/plotly/dash/issues/1143

- Dash.jl Julia component generation

Added
- [165](https://github.com/plotly/dash-html-components/pull/165) Add support for Dash.jl Julia component generation.