v0.2.0

• Feature: Support echo replacements (asterisk for password prompts)
  (#11)

$stdio->getReadline()->setEcho('*');

• Feature: Add accessors for text input buffer and current cursor position
  (#8 and #9)

$stdio->getReadline()->setInput('hello');
$stdio->getReadline()->getCursorPosition();

• Feature: All setters now return self to allow easy method chaining
  (#7)

$stdio->getReadline()->setPrompt('Password: ')->setEcho('*')->setInput('secret');