Version 0.7

    - customizing attributes of HTML tag <pre> using variable g:PhHtmlPreAttrs
    - select between conditions in .vimrc or .vimrc.pandoc using variables
      defined in a new attribute vars (see docs)
Version 0.8

    - both HTML rendering engines do not use tag <tt> any longer
    - improved TOhtml rendering engine: full support of line numbering,
      regular spaces instead HTML non-breaking spaces
    - docs updated
Version 0.8.1

fixed possible error messages about not found patterns when using Tohtml engine
Version 0.8.2: fixed trim algorithm in TOhtml engine; minor fixes and improvements
Version 0.8.3

    - properly restore global variables related to TOhtml
    - minor (mostly stylistic) imrovements in vimhl.hs