Bump tracing-subscriber from 0.2.25 to 0.3.18 #2539

Job	Run time
mac (stable, x86_64-apple-darwin)	8m 41s
linux (stable, i686-unknown-linux-gnu)	7m 14s
mac (nightly, x86_64-apple-darwin)	9m 42s
windows (stable, x86_64-pc-windows-gnu)	5m 18s
linux (stable, i686-unknown-linux-musl)	4m 28s
windows (stable, x86_64-pc-windows-msvc)	5m 3s
windows (nightly, x86_64-pc-windows-gnu)	7m 26s
linux (stable, x86_64-unknown-linux-gnu)	6m 22s
linux (stable, x86_64-unknown-linux-musl)	7m 20s
windows (nightly, x86_64-pc-windows-msvc)	10m 51s
linux (stable, aarch64-unknown-linux-gnu)	4m 38s
linux (beta, i686-unknown-linux-gnu)	6m 38s
linux (beta, i686-unknown-linux-musl)	4m 54s
linux (beta, x86_64-unknown-linux-gnu)	4m 54s
linux (beta, x86_64-unknown-linux-musl)	8m 17s
linux (beta, aarch64-unknown-linux-gnu)	4m 53s
linux (nightly, i686-unknown-linux-gnu)	7m 12s
linux (nightly, i686-unknown-linux-musl)	5m 5s
linux (nightly, x86_64-unknown-linux-gnu)	5m 8s
linux (nightly, x86_64-unknown-linux-musl)	5m 6s
linux (nightly, aarch64-unknown-linux-gnu)	9m 11s
	2h 18m 21s

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