Fixes regression on Windows introduced in 3.x branch.

Breaking change: now uses ECMAScript Modules

Fix certificate renewal bug and add latest LA staging CA root cert

Fix crash on receiving Retry-After header, improve developer docs

Update dependencies

Fix HTTP → HTTPS redirects

Change repository link to GitHub mirror in npm package file

Updated documentation

One major fix (crash) and a couple of minor fixes/improvements

  - No longer crashes if OCSP request received before certificate created.
  - Cosmetic: format certificate details nicely in log message.
  - Minor: fix capitalisation in log message.

Update log format to match Site.js and remove debug output