bump v0.3.1 #2222

Job	Run time
x86_64-unknown-linux-gnu	12m 50s
i686-unknown-linux-gnu	13m 21s
x86_64-unknown-linux-gnu-static-crt	12m 38s
x86_64-unknown-linux-musl	13m 17s
i686-unknown-linux-gnu-static-crt	13m 57s
aarch64-unknown-linux-gnu	13m 41s
armv7-unknown-linux-gnueabi	14m 7s
armv7-unknown-linux-gnueabihf	14m 6s
aarch64-unknown-linux-gnu-static-crt	14m 42s
aarch64-unknown-linux-musl	14m 16s
armv7-unknown-linux-gnueabi-static-crt	14m 39s
armv7-unknown-linux-musleabihf	14m 34s
x86_64-pc-windows-msvc	23m 40s
i686-pc-windows-msvc	20m 59s
x86_64-pc-windows-msvc-static-crt	21m 43s
i686-pc-windows-msvc-static-crt	23m 51s
x86_64-apple-darwin	16m 10s
aarch64-apple-darwin	9m 30s
x86_64-apple-darwin-static-crt	18m 58s
aarch64-apple-darwin-static-crt	10m 3s
Release	1m 3s
Docker Image	0s
	5h 12m 5s

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