v0.2.0

Imported release from original tag date 2021-06-18.

• Feature: Simplify App usage by making LoopInterface argument optional.
  (#22 by @clue)

  // old (still supported)
  $loop = React\EventLoop\Factory::create();
  $app = new FrameworkX\App($loop);
  
  // new (using default loop)
  $app = new FrameworkX\App();

• Feature: Add middleware support.
  (#18 by @clue)

• Feature: Refactor and simplify route dispatcher.
  (#21 by @clue)

• Feature: Add Generator-based coroutine implementation.
  (#17 by @clue)

• Minor documentation improvements.
  (#15, #16 and #19 by @clue)