v2.3.0

• Feature: Emit audible/visible BELL signal when using a disabled function.
  (#86 and #87 by @clue)

  By default, this project will emit an audible/visible BELL signal when the user
  tries to execute an otherwise disabled function, such as using the
  left or backspace keys when already at the beginning of the line.

• Deprecated: Deprecate Readline class and move all methods to Stdio.
  (#84 by @clue)

  // deprecated:
  $stdio->getReadline()->setPrompt('> ');
  
  // recommended alternative:
  $stdio->setPrompt('> ');

• Fix: Fix closing to emit final close event and clean up all listeners.
  (#88 by @clue)

• Improve test suite to test against legacy PHP 5.3 through PHP 7.3 and support PHPUnit 7.
  (#85 by @clue)