feat(frequency): add `freq` alias (#904) #108

Job	Run time
deny (bans licenses sources)	30s
fuzz (pica-record-ref, fuzz, fuzz-record-ref, 120)	3m 30s
deny (advisories)	36s
test (ubuntu-latest, stable, x86_64-unknown-linux-gnu)	1m 6s
fuzz (pica-record-matcher, fuzz, fuzz-record-matcher, 200)	4m 56s
test (ubuntu-latest, beta, x86_64-unknown-linux-gnu)	1m 12s
fuzz (pica-path, fuzz, fuzz-path, 200)	5m 5s
test (ubuntu-latest, nightly, x86_64-unknown-linux-gnu)	2m 21s
fuzz (pica-format, fuzz, fuzz-format, 200)	5m 5s
test (windows-latest, stable, i686-pc-windows-msvc)	3m 34s
fuzz (pica-query, fuzz, fuzz-query, 200)	5m 1s
test (macos-latest, stable, x86_64-apple-darwin)	1m 25s
rustdoc	1m 0s
outdated	5m 1s
msrv	20s
clippy	1m 6s
rustfmt	21s
udeps	6m 24s
publish	41s
ci	1s
	49m 15s

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