anchor.diff:  * log warning rather than crash if front cover image cannot be embedded (such as a broken SVG)
   * do not insert blank line in index when term is forced to break (#1665)
   * honor prepress page margins on subsequent pages in index (#1929)
  -* use more robust strategy for line height normalization that accounts for line contains only monospaced text (#1650)
  +* use more robust strategy for line height normalization that accounts for case when line contains only monospaced text (#1650)
   * add support for line-height property on lead role as documented
   * prevent generator from allocating space for placeholder null char (used for anchors) if font is missing glyph (#1672)
   * ensure background and admonition icon image files are closed after being read (#1566)
  
positive.code: * 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
  
  == 1.6.2 (2021-12-31) - @mojavelinux
  
  
negative.code: * escape bare ampersand in attribution and citetitle of quote or verse block (#1662)
  * fix numeric assertions in test suite (#1542)
  * prevent converter for list item from inserting new page to position marker when next page is already instantiated (#2001)
  * keep block anchor with code block when block is moved to next page (#1897)
  * keep block anchor with admonition block when block is moved to next page
  * remove poorly-defined (and undocumented) border bottom property for caption
  * fix crash when theme specifies CMYK value for table border color (#1700)
  