Merge pull request #27 from biscuit-auth/release-0.3.1 #25

Job	Run time
linux (x86_64)	2m 34s
linux (x86)	3m 51s
linux (aarch64)	3m 7s
linux (armv7)	3m 15s
linux (s390x)	3m 8s
linux (ppc64le)	2m 58s
linux-musl (x86_64-unknown-linux-musl, x86_64-musl)	2m 27s
linux-musl (i686-unknown-linux-musl, i686-musl)	2m 31s
linux-musl (aarch64-unknown-linux-musl, aarch64-musl)	2m 31s
linux-musl (armv7-unknown-linux-musleabihf, armv7-musleabihf)	2m 27s
macos (x86_64)	1m 39s
linux-musl (powerpc64le-unknown-linux-musl, powerpc64le-musl)	2m 41s
macos (aarch64)	1m 20s
sdist	8s
windows (x64)	4m 26s
windows (x86)	4m 49s
Release	0s
	43m 52s

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