Update criterion requirement from 0.3 to 0.5 (#80)

Updates the requirements on [criterion](https://github.com/bheisler/criterion.rs) to permit the latest version.
- [Changelog](https://github.com/bheisler/criterion.rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bheisler/criterion.rs/compare/0.3.0...0.5.0)

---
updated-dependencies:
- dependency-name: criterion
  dependency-type: direct:production
...

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Cargo.toml

@@ -29,7 +29,7 @@ zeroize = { version = "1.5", features = [ "zeroize_derive" ] }
 [dev-dependencies]
 rand = "0.8"
 bincode = "1"
-criterion = "0.3"
+criterion = "0.5"
 ed25519-zebra-legacy = { package = "ed25519-zebra", version = "1" }
 color-eyre = "0.6"
 once_cell = "1.4"