0.1.4 - The black release

You can have any linter as long as it is black

New

• Black-ified
• Added linting step and simplified test matrix

Fixes

• UNIQUE constraint failed: wagtail_headless_preview_pagepreview.token
• Static files not packaged
• Wrong JS file loaded for live preview
• Wrong token used in live preview.
• Explicit utf-8 encoding for long description to fix UnicodeDecodeError: 'ascii' codec can't decode byte 0xf0 in position 6282: ordinal not in range(128) on some systems when trying to pip install