Merge pull request #835 from zcash/halo2_poseidon-0.1.0 #554

Job	Run time
Bitrot check	53s
Build target wasm32-unknown-unknown	2m 37s
Test on ubuntu-latest	8m 14s
Build target wasm32-wasi	2m 27s
Test on windows-latest	11m 31s
Test on i686-unknown-linux-gnu	14m 20s
Book tests	2m 10s
Test on macOS-latest	6m 54s
Test on i686-unknown-linux-gnu with beta features	14m 8s
Code coverage	3m 30s
Test on ubuntu-latest with beta features	8m 3s
Test on i686-unknown-linux-gnu with nightly features	16m 4s
Intra-doc links	2m 17s
Test on windows-latest with beta features	11m 3s
Rustfmt	13s
Test on macOS-latest with beta features	8m 12s
Test on ubuntu-latest with nightly features	9m 7s
Test on windows-latest with nightly features	12m 4s
Test on macOS-latest with nightly features	8m 31s
	2h 22m 18s

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