Update criterion requirement from 0.3 to 0.4 (#31)

Updates the requirements on [criterion](https://github.com/bheisler/criterion.rs) to permit the latest version.
- [Release notes](https://github.com/bheisler/criterion.rs/releases)
- [Changelog](https://github.com/bheisler/criterion.rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bheisler/criterion.rs/compare/0.3.0...0.4.0)

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

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Cargo.toml

@@ -25,7 +25,7 @@ parity-wasm = { version = "0.45", default-features = false }
 
 [dev-dependencies]
 binaryen = "0.12"
-criterion = "0.3"
+criterion = "0.4"
 diff = "0.1"
 pretty_assertions = "1"
 rand = "0.8"