Test

use markdown in deprecation notes #322

Job	Run time
check_no_std	17s
test (1.75.0)	1m 22s
test (1.75.0, --features variant)	1m 23s
test (1.75.0, --features alloc)	1m 14s
test (1.75.0, --features std)	1m 23s
test (1.75.0, --features alloc,variant)	1m 22s
test (1.75.0, --features std,variant)	2m 23s
test (1.75.0, --features nohash-hasher,variant)	1m 20s
test (stable)	1m 14s
test (stable, --features variant)	1m 22s
test (stable, --features alloc)	1m 35s
test (stable, --features std)	1m 18s
test (stable, --features alloc,variant)	1m 18s
test (stable, --features std,variant)	1m 14s
test (stable, --features nohash-hasher,variant)	1m 41s
test (nightly)	1m 10s
test (nightly, --features variant)	1m 22s
test (nightly, --features alloc)	1m 13s
test (nightly, --features std)	1m 11s
test (nightly, --features alloc,variant)	1m 15s
test (nightly, --features std,variant)	1m 19s
test (nightly, --features nohash-hasher,variant)	1m 14s
test (nightly, -Z minimal-versions --all-features)	1m 29s
	30m 39s

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