targrep 0.8.0

Changed

• --load-limit N adapts during the run instead of checking once at
  startup. All -j workers start; while the 1-minute load average from other
  processes is above N, only one of them searches, and the rest wait between
  archives. The load is rechecked every 5 s, and one job is added back per
  check as it falls. trg's own workers are taken off the load before it is
  compared, so a wide -j does not throttle itself. Output, ordering and
  exit codes are unaffected.
• --load-limit now works on macOS too. It was Linux-only.