New `Itertools::tail` #819

Job	Run time
doc	6s
check format	7s
check	9s
check (--no-default-features)	27s
semver-checks	13s
msrv	1m 2s
check (--no-default-features --features use_alloc)	7s
test	55s
check (--all-targets --all-features)	20s
All checks succeeded	2s
	3m 28s

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