0.42.0

What's Changed

• fix cov by @rmorshea in #831
• remove IDOM_FEATURE_INDEX_AS_DEFAULT_KEY opt by @rmorshea in #840
• allow users to configure html head by @rmorshea in #835
• better run func warning by @rmorshea in #842
• Make IDOM_DEBUG_MODE mutable + add Option.subscribe method by @rmorshea in #843
• Form serialize by @acivitillo in #699
• html_to_vdom transform to remove html/body but preserve head content by @Archmonger in #832
• add svg elements by @rmorshea in #844

Full Changelog: 0.41.0...0.42.0