Update criterion requirement from 0.4.0 to 0.5.0

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](bheisler/criterion.rs@0.4.0...0.5.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -15,7 +15,7 @@ documentation = "https://docs.rs/brainhug"
 travis-ci = { repository = "sn99/brainhug", branch = "master" }
 
 [dev-dependencies]
-criterion = "0.4.0"
+criterion = "0.5.0"
 
 [[bench]]
 name = "benchmark"