chore: release 0.3.1 #202

Job	Run time
Miri (x86_64-unknown-linux-gnu)	40s
Miri (aarch64-unknown-linux-gnu)	34s
docs	24s
Clippy	28s
feature checks	40s
Test (aarch64-unknown-linux-gnu, nightly)	50s
Test (aarch64-unknown-linux-gnu, stable)	44s
Test (aarch64-unknown-linux-gnu, 1.66)	1m 56s
Test (i686-unknown-linux-gnu, nightly)	52s
Test (i686-unknown-linux-gnu, stable)	38s
fmt	16s
Test (i686-unknown-linux-gnu, 1.66)	1m 46s
Test (x86_64-unknown-linux-gnu, nightly)	34s
Test (x86_64-unknown-linux-gnu, stable)	29s
Test (x86_64-unknown-linux-gnu, 1.66)	1m 19s
deny / cargo deny check	16s
	12m 26s

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