Bump log from 0.4.20 to 0.4.21 #821

# to view logs

Job	Run time
check	2m 42s
matrix	15s
test-client-check	3m 15s
test-client-matrix	40s
tests	15m 43s
clippy	6m 23s
Check MSRV	7m 2s
build (x86_64-unknown-linux-musl)	12m 37s
build (i686-unknown-linux-musl)	11m 42s
build (armv7-unknown-linux-musleabihf)	13m 21s
build (aarch64-unknown-linux-musl)	12m 58s
build (x86_64-unknown-freebsd)	11m 48s
Build test client (x86_64-unknown-linux-musl)	5m 17s
test-client-clippy	5m 8s
Build test client (i686-unknown-linux-musl)	6m 54s
Build test client (armv7-unknown-linux-musleabihf)	6m 38s
Build test client (aarch64-unknown-linux-musl)	6m 20s
Build test client (x86_64-unknown-freebsd)	46m 55s
Build test client (.exe, x86_64-pc-windows-gnu)	6m 50s
Package nightly release	14m 7s
	3h 16m 35s

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