v1.6.0

• Feature: Forward compatibility with PHP 8.1 release.
  (#67 and #68 by @clue)

• Fix: Fix reporting refused connections on Windows.
  (#69 by @clue)

• Improve CI setup and documentation.
  (#70 and #65 by @clue, #64 by @szepeviktor and #66 by @PaulRotmann)