v0.5.0

Added

• Load testing: term-rest-client load, Alt+L / F7 and l in the terminal app, and a
  Load test dialog in the browser UI. Virtual users run a request, or a folder's requests
  in order, each with its own variables (a captured login token stays with its user).
  Constant users (-vus, -duration), ramping stages (-stages 30s:50,1m:50,30s:0), or
  a fixed or ramping request rate (-rate 200/s, /s stage targets) where arrivals with
  no free user are dropped and counted. Results: requests/s, failed requests, latency
  p50/p90/p95/p99 overall and per request, status codes, error reasons, bytes, a
  per-second timeline, and tests as checks. -threshold "p95<300ms,errors<1%" sets the
  exit code; -out writes JSON or CSV. Live sparklines in the terminal, live charts in
  the browser. Hosts other than this machine or a private network need confirming
  (-yes without a terminal).
• The demo server has /slow, /flaky and /status/{code} for trying load tests.

Fixed

• The browser UI didn't show requests at the top level (outside any collection), such as
  the sample's Health Check.