Dash-html-components

Added
- Unminified dev bundle support. [64](https://github.com/plotly/dash-html-components/pull/64)

Unreleased

Changed
- `dash_html_components/__init__.py` now imports from Python class files rather than generating classes at runtime,
adding support for IDE auto complete etc.

Added
- A `n_clicks_timestamp` property was added to all of the components. This property represents the date that the element was clicked on and can be used to determine _which element was clicked on_ in callbacks with multiple elements. This is considered a stop-gap solution: ultimately we'll want a solution that works for _all_ properties across all components, not just the `n_clicks` property. https://github.com/plotly/dash-html-components/pull/45

Added
- `aria-*` and `data-*` attributes are now supported in all dash html components [40](https://github.com/plotly/dash-html-components/pull/40)
These new keywords can be added using a dictionary expansion, e.g.

html.Div(id="my-div", **{"data-toggle": "toggled", "aria-toggled": "true"})

- The `role` attribute was added to all components
- The `autoComplete` property was added to `textarea`

Added
- Previously, if a user named their app file `dash.py`, an unhelpful error
message would be raised. Now, `import dash_html_components` will check if
the user has a file named `dash.py` and warn the users appropriately.
https://github.com/plotly/dash-html-components/pull/39

Changed
- Moved `PropTypes` import from using `react` to using `prop-types` package to support using React 16+ in `dash-renderer`

Added
- Added `Picture` and `Base` components
- Added `muted` property to `Audio` component