Bump tokio-stream from 0.1.14 to 0.1.15 #842

Job	Run time
matrix	40s
test-client-matrix	55s
check	7m 19s
test-client-check	3m 36s
test-client-clippy	4m 14s
Build test client (x86_64-unknown-linux-musl)	6m 23s
Build test client (i686-unknown-linux-musl)	6m 40s
Build test client (armv7-unknown-linux-musleabihf)	6m 26s
Build test client (aarch64-unknown-linux-musl)	6m 18s
Build test client (x86_64-unknown-freebsd)	5m 55s
Build test client (.exe, x86_64-pc-windows-gnu)	6m 24s
clippy	7m 26s
tests	16m 23s
Check MSRV	7m 51s
build (x86_64-unknown-linux-musl)	5m 1s
build (i686-unknown-linux-musl)	4m 58s
build (armv7-unknown-linux-musleabihf)	13m 37s
build (aarch64-unknown-linux-musl)	11m 33s
build (x86_64-unknown-freebsd)	5m 1s
Package nightly release	13m 44s
	2h 20m 24s

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