Update click to 6.7

[pyup-bot]

There's a new version of click available.
You are currently using 6.6. I have updated it to 6.7

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

Changelog

6.7

---

(bugfix release; released on January 6th 2017)

• Make click.progressbar work with codecs.open files. See 637.
• Fix bug in bash completion with nested subcommands. See 639.
• Fix test runner not saving caller env correctly. See 644.
• Fix handling of SIGPIPE. See 626
• Deal with broken Windows environments such as Google App Engine's. See 711.

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 #52