Add comparison to chrono_tz #613

Job	Run time
clippy-pedantic	21s
audit	17s
DevSkim	27s
cross-miri (aarch64-unknown-linux-gnu)	46s
cross-miri (i586-unknown-linux-gnu)	47s
doc	25s
fmt	21s
cross-miri (powerpc-unknown-linux-gnu)	42s
lint (1.56)	1m 39s
cross-miri (powerpc64-unknown-linux-gnu)	43s
lint (1.56, -Zminimal-versions)	1m 29s
Miri	57s
test	39s
lint (stable)	23s
cross-miri (powerpc64le-unknown-linux-gnu)	40s
lint (stable, -Zminimal-versions)	21s
lint (nightly)	27s
lint (nightly, -Zminimal-versions)	26s
	11m 50s

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