Update argparse to 1.4.0

[pyup-bot]

There's a new version of argparse available.
You are currently using 1.2.1. I have updated it to 1.4.0

These links might come in handy: PyPi | Changelog | Repo

Changelog

1.4.0

---

• make argparse behave for default args aka
  issue 12776, 11839: call argparse type function only once.
• move to github:ThomasWaldmann/argparse
• add TW as maintainer / give TW's email
• add some usecase to README, clarify issue tracking
• add a note to tox.ini about testing on dead snakes

1.3.0

---

• added aliases support (thanks to Roland Kammerer!) + tests for it
• use tox for testing python >= 2.6
• tests successfully on 3.4 also (without random hash seed)
• added argparse.external_lib = True so one can test one is really using /
  testing the external library (and not the builtin one in stdlib of recent
  Pythons)

1.2.2

---

• added universal wheel support, built, signed and uploaded with:
  python setup.py sdist bdist_wheel upload --identity="Thomas Waldmann" --sign
• host the files on pypi

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

Happy merging! 🤖