v0.5.0

• Feature: Add history support.
  (#40 by @clue)
• Feature: Add autocomplete support.
  (#41 by @clue)
• Feature: Suggest using ext-mbstring, otherwise use regex fallback.
  (#42 by @clue)
• Remove / BC break: Remove undocumented and low quality skeletons/helpers for.
  Buffer, ProgressBar and Spinner (mostly dead code)
  (#39, #43 by @clue)
• First class support for PHP 5.3 through PHP 7 and HHVM.
  (#44 by @clue)
• Simplify and restructure examples.
  (#45 by @clue)