build(deps): bump keccak from 0.1.2 to 0.1.3 (#436)

Bumps [keccak](https://github.com/RustCrypto/sponges) from 0.1.2 to 0.1.3.
- [Release notes](https://github.com/RustCrypto/sponges/releases)
- [Commits](RustCrypto/sponges@keccak-v0.1.2...keccak-v0.1.3)

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

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