v1.3.0

• Feature: Improve memory consumption by cleaning up garbage references.
  (#35 by @clue)

• Fix minor documentation typos.
  (#28 by @seregazhuk)

• Improve test suite by locking Travis distro so new defaults will not break the build,
  support PHPUnit 6 and update Travis config to also test against PHP 7.2.
  (#30 by @clue, #31 by @carusogabriel and #32 by @andreybolonin)

• Update project homepage.
  (#34 by @clue)