Datasette-copyable

- Now depends on Datasette 0.63+.

- Fixed 500 error with `.copyable?_labels=on`. 4

- Now depends on Datasette 0.49.

- TSV format is now compatible with Google Sheets and Excel. 3
- Table headings are now included in the formatted tables. 2
- Added a "Copy" button for copying the data to your clipboard. 1
- Plugin now has a live demo at https://fivethirtyeight.datasettes.com/

* Initial release