Bump tracing-subscriber from 0.2.15 to 0.2.17 (#31)

Bumps [tracing-subscriber](https://github.com/tokio-rs/tracing) from 0.2.15 to 0.2.17.
- [Release notes](https://github.com/tokio-rs/tracing/releases)
- [Commits](tokio-rs/tracing@tracing-subscriber-0.2.15...tracing-subscriber-0.2.17)

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