v0.12.20

New Features

• Add set_lifespan (#744)
• Add title= kwarg to fast_app() constructor (#740), thanks to @mmacpherson
• Allow any Mapping children to specify attributes. fix #737 (#738), thanks to @gazpachoking

Bugs Squashed

• Correct treatment of empty/boolean attributes in the html2ft function (#732), thanks to @renatodamas
• html2ft handling empty attribute (#731)
• Toasts inserted at bottom of page (#703)