Update tracing-subscriber to v0.3.17

[s1gtrap]

Simply bump tracing-subscriber to latest v0.3.17.

Fixes #534, resolved by tokio-rs/tracing#2566.

Not sure if any of the checkpoints apply for such a minor change?

[thedodd]

I would prefer that you actually just do cargo update, and then verify that a sufficient version has been pinned in the lock file. Let's not update the Cargo.toml itself in this case.

[s1gtrap]

I would prefer that you actually just do cargo update, and then verify that a sufficient version has been pinned in the lock file. Let's not update the Cargo.toml itself in this case.

Interesting, why is that exactly? I assume cargo update changes the locked version to the latest? But I just ran it as you said and amended my branch.

[s1gtrap]

I forgot to push the changes beck then, but I rebased it on master and pushed it just now. Thought I'm not sure how relevant it is at this point.. @thedodd

[thedodd]

I don't think that this PR is needed any longer.