Dash-labs

Added
- [107](https://github.com/plotly/dash-labs/pull/107) Add session system.

Fixed

:warning: This is a breaking change for the `pages` plugin
- [109](https://github.com/plotly/dash-labs/pull/109) Makes dash-labs compatible with dash 2.5
- `dash.register_page` is renamed to `dash_labs_plugins.register_page`

Fixed
- [104](https://github.com/plotly/dash-labs/pull/104) Fixes a bug in the twitter card meta tags image url.

Fixed
- [99](https://github.com/plotly/dash-labs/pull/99) Fixes a bug in the twitter card meta tags.
Added
- [99](https://github.com/plotly/dash-labs/pull/99) Adds image_url property to dash.page_registry This gives the option of using a link for the image in the meta tags rather than an image file in the app's assets folder.

Added
- `print_registry()` - Debugging tool and pretty printer for dash.page_registry.

Fixed
- added encoding='utf-8' to open function