v1.13.0

• Feature: Include timeout logic to avoid dependency on reactphp/promise-timer.
  (#305 by @clue)

• Feature: Improve errno detection for failed connections without ext-sockets.
  (#304 by @clue)

• Improve test suite, clean up leftover .sock files and report failed assertions.
  (#299, #300, #301 and #306 by @clue)