This release is mostly motivated by the fix for the panic experienced by people having blackfriday configured as defaultMarkdownHandler (#9968). The Blackfriday support was removed in Hugo v0.100.0 after being deprecated with a warning for a long time.
v0.100.1 fix panic with markdownify/RenderString with shortcode on Page with no content file.
$page.RenderString (see #6703) finally supports shortcodes, and shortcode improvements is the main theme in Hugo 0.100.0.