Adds:
- a reload button when a datahandler is passed to EditGrid
- `title` , `description` and `show_title` traits to EditGrid that are observed and update a heading to the grid
What's Changed
* β¨-add-reload-button-to-editgrid-datahandler by jgunstone in https://github.com/maxfordham/ipyautoui/pull/142
**Full Changelog**: https://github.com/maxfordham/ipyautoui/compare/0.4.7...0.4.8