• mdcat now fills paragraph text to the column limit, i.e. fills up short
  lines and wraps long lines (see [GH-4]).
• mdcat now allows to control color and style via a new[33m theme[0m field in
  [33mpulldown_cmark_mdcat::Settings[0m of type[33m pulldown_cmark_mdcat::Theme[0m (see [GH-48
  ]).
