0.12.0 — no em dashes in interface text

Added

• I-118 Em dashes in interface text. Use a full stop, a comma, a colon
  or a second element. The mark is ambiguous on its own: it stands in for
  four different ones, and the reader only learns which after reading past
  it. It is also the clearest tell of machine-written copy, and copy that
  reads as generated is copy the reader trusts less. The em-dash detector
  reads element text and the attributes a reader hears or sees; scripts,
  styles, comments, class names and documentation are not interface text.
  The en dash keeps its one job, a range read as "to" (2-10 seats).