chore(deps): update whatlang requirement from 0.12.0 to 0.16.0

Updates the requirements on [whatlang](https://github.com/greyblake/whatlang-rs) to permit the latest version.
- [Release notes](https://github.com/greyblake/whatlang-rs/releases)
- [Changelog](https://github.com/greyblake/whatlang-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/greyblake/whatlang-rs/compare/v0.12.0...v0.16.0)

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

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

Cargo.toml

@@ -16,7 +16,7 @@ readme = "README.md"
 
 [dependencies]
 log = "0.4.17"
-whatlang = "0.12.0"
+whatlang = "0.16.0"
 
 [features]
 default = ["search"]