Update dependencies

[rukai]

Update dependencies to their latest versions.
e.g. I can see that the metrics dep is 0.12 but the latest is 0.17

Once the repo goes public we can track out of date dependencies on https://deps.rs/ but for now I think we just need to manually check the version ourselves.

[Claudenw]

Is there a reason not to use semantic numbering and just use ^0.12.0 as the value

[rukai]

as kuangda mentioned in #150 semver is the default.
The benefit for upgrading from 0.12 to 0.17 is to get access to new features and bug fixes in case we need them.

This issue was created as a good first issue as updating dependencies is an easy way to increase familiarity with a codebase without yet understanding the problem domain.

[rukai]

We still have the dependencies that require code changes to go!