Bump structopt from 0.3.14 to 0.3.16

[dependabot-preview[bot]]

Bumps structopt from 0.3.14 to 0.3.16.

Changelog

Sourced from structopt's changelog.

v0.3.16 (2020-08-05)

• Added the new example.
• Allow #[structopt(flatten)] fields to have doc comments. The comments are ignored.
• The paw crate is now being reexported when paw feature is enabled, see [#407](https://github.com/TeXitoi/structopt/issues/407).

v0.3.15 (2020-06-16)

• Minor documentation improvements.
• Fixed a latent bug, courtesy of @Aaron1011.

Commits

• 54f73b1 v0.3.16
• e827ce6 Update changelog
• 9fe3f04 Add support for lower/upper in rename_all (#412)
• 26856fe Reexport paw
• 2d8ba48 Allow #[flatten] fields to have doc comments but ignore them (comments) (#414)
• e47d78c Add required_if example
• c7d028a Fix required_if arg name in example
• b1174e5 v0.3.15
• 7e431cb Flattening a subcommand now panics with a meaningful error message
• caa1455 Merge pull request #400 from TeXitoi/fix/matches-span
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.