v7.3.0

Added

• Experimental support for Markdown
  (#1645)

Changed

• All testCase messages now emitted upfront at the start of the run (relevant for formatter authors) (#1408
  #1669)
• Clarify that the JSON formatter will not be removed any time soon

Fixed

• this now has correct TypeScript type in support code functions (#1667 #1690)
• Progress bar formatter now reports total step count correctly (#1579
  #1669)
• Rerun functionality will now run nothing if the rerun file is empty from the previous run (#1302 #1568)
• All messages now emitted with project-relative uris
  (#1534
  #1672)
• Json formatter now works with tagged examples
  (#1621
  #1651)