Bumps [structopt](https://github.com/TeXitoi/structopt) from 0.3.15 to 0.3.17.
- [Release notes](https://github.com/TeXitoi/structopt/releases)
- [Changelog](https://github.com/TeXitoi/structopt/blob/master/CHANGELOG.md)
- [Commits](TeXitoi/structopt@v0.3.15...v0.3.17)

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