Prep 0.3.7 release #258

Job	Run time
deny	3m 33s
build (stable)	14s
clippy	18s
build (beta)	20s
coverage	2m 9s
doc	12s
examples (stable)	17s
build (nightly-2023-04-01)	23s
examples (beta)	18s
examples (nightly-2023-04-01)	20s
formatting	59s
Build for a no_std target (stable)	19s
Rust 1.58.0 MSRV	1m 22s
Build for a no_std target (beta)	18s
test (stable)	14s
udeps	4m 14s
Build for a no_std target (nightly-2023-04-01)	22s
test (beta)	21s
Rust 1.59.0 MSRV	1m 46s
test (nightly-2023-04-01)	55s
	18m 54s

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