anchor.diff:  * add Ruby 3.1 to CI matrix; use as primary Ruby
   * test against Asciidoctor upstream (#1821)
   * skip tests for unreadable files when euid is 0
  -* use prawn-table release and drop recommendation to use the development version
  +* use prawn-table release and drop recommendation to use the development version (converter now patches prawn-table)
   
   == 1.6.2 (2021-12-31) - @mojavelinux
   
  
positive.code: * allow theme to disable title page by assigning false to `title_page` category key (#1754)
  * allow Rouge theme to be specified as theme class or instance (API only)
  * allow theme to control font size of dot leader in TOC
  * allow section to override outlinelevels for self and children using outlinelevels attribute on section
  * use value of `author` attribute for PDF info and pdfmark if locked by the API (#1778)
  * only extend theme in extends hierarchy once unless modified with `!important` (#1800)
  * add print-optimized themes (default-for-print and default-for-print-with-fallback-font) (#1699)
  
negative.code: Enhancements::
  
  * make delimited blocks breakable by default; require the `unbreakable` option on the block to retain the previous "`keep together`" behavior (#2004, #578, #509, #240)
  * add support for the %unbreakable option on a table to prevent it from being split across pages (#2022, #871, #819, #331)
  * add support for the %breakable option on a table (special case) to keep the caption and ID with the start of the table (#2022, #993)
  * implement smart bottom margins on blocks to prevent extra space below blocks, particularly nested blocks (#1515, #1513, #1845)
  * drop support for `top-margin` key on block and prose categories in theme; space between delimited blocks and lists now controlled using bottom margins only (#1515)
  * allow location of anchor for block to be positioned relative to content using `block-anchor-top` key in theme (#2013)
  * allow page numbering and running content to start after first page of a document without a title page by assigning an integer to the respective `start_at` theme key (#1644)
  * allow page numbering and running content to start after toc (wherever it's placed) by assigning the keyword `after-toc` to the respective `start_at` theme key (#1763)
  * allow theme to configure page numbering to start at cover (#1727)
  * allow the front and back cover images to be defined in the theme (#1584)
  * allow the front and back cover images to be specified as a data URI (#1584)
  * allow theme to control margin and content margin of running content per periphery (header or footer) and per side (recto or verso) (#994)
  * allow theme to control border style of delimited blocks (example, sidebar, code, admonition, verse, quote) (#1586)
  * allow theme to control font color of first line of abstract using `abstract-first-line-font-color` key
  * allow theme to control background color and border offset (only for background) of links (#1705)
  * support custom role on paragraph to allow theme to control font properties (#483)
  * change lead category in theme to built-in role named lead (#2031)
  * allow theme to control line height of blocks using line-height property where font properties are accepted (#2032)
  * don't render index section if index is empty (i.e., there are no index entries)
  * allow title of special section to be hidden by setting `untitled` option on section
  * stabilize font paths in built-in themes by prefixing paths with GEM_FONTS_DIR (#1568)
  * assign `page-layout` attribute in running content so it can be used to select a background per layout (#1570)
  * reset numbering of footnotes in each chapter (#1639)
  * add chapter xreftext to label of footnote reference that refers to previous chapter (#1639)
  * add support for assigning the same font file to all font variants (i.e., styles) using the wildcard key (`*`) (#1588)
  * bundle Noto Sans in addition to Noto Serif and add built-in theme sans-with-fallback-font (#2010)
  * allow caption max-width to be set to percentage of content by passing argument to fit-content function (#1494)
  