Bump rand_chacha from 0.3.0 to 0.3.1 (#1057)

Bumps [rand_chacha](https://github.com/rust-random/rand) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand@rand_chacha-0.3.0...rand_chacha-0.3.1)

---
updated-dependencies:
- dependency-name: rand_chacha
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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