Update pexpect to 4.4.0

[pyup-bot]

There's a new version of pexpect available.
You are currently using 4.3.1. I have updated it to 4.4.0

These links might come in handy: PyPI | Changelog | Docs

Changelog

4.4

• :class:~.PopenSpawn now has a preexec_fn parameter, like :class:~.spawn
  and :class:subprocess.Popen, for a function to be called in the child
  process before executing the new command. Like in Popen, this works only
  in POSIX, and can cause issues if your application also uses threads
  (:ghpull:460).
• Significant performance improvements when processing large amounts of data
  (:ghpull:464).
• Ensure that spawn.closed gets set by :meth:~.spawn.close, and improve
  an example for passing SIGWINCH through to a child process (:ghpull:466).

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[pyup-bot]

Closing this in favor of #214