v1.2.1

• README improvements
  (#28 by @jsor)

• Improve test suite by adding forward compatiblity with PHPUnit 6 and
  fix test suite forward compatibility with upcoming EventLoop releases
  (#30 and #31 by @clue)

v1.2.0

• Feature: Only start timers if input Promise is still pending and
  return a settled output promise if the input is already settled.
  (#25 by @clue)

• Feature: Cap minimum timer interval at 1µs across all versions
  (#23 by @clue)

• Feature: Forward compatibility with EventLoop v1.0 and v0.5
  (#27 by @clue)

• Improve test suite by adding PHPUnit to require-dev and
  lock Travis distro so new defaults will not break the build
  (#24 and #26 by @clue)

v1.1.1

• Improve test suite to use PSR-4 autoloader and proper namespaces.
  (#21 by @clue)

v1.1.0

• Feature: Support promise cancellation for all timer primitives
  (#18 by @clue)

v1.0.0

• First tagged release