Version 0.4.0

(Relatively) major release:

New features:

• Handle errors while rendering dashboard (#131)
• Defer rendering of dashboard contents until page is rendered (#123)
• Add Melt transform (#122)
• Implement DerivedSource with ability to filter and transform existing sources (#121)
• Add caching to DerivedSource
• Use Datetime pickers (#119)

Bugfixes and minor improvements:

• Clear original source cache on DerivedSource
• Allow providing custom Download labels (#130)
• Fix handling of range filters (#129)
• Unpack panes correctly on Views (#128)
• Fixed dask kwarg on JSONSource (#127)
• Pin python3.8 in conda build env
• Ensure None on widget filter is handled (#120)
• Improve docs (#112)