Merge pull request #831 from zcash/poseidon-primitive #4075

Job	Run time
Bitrot check	1m 26s
Build target wasm32-unknown-unknown	1m 51s
Book tests	1m 28s
Build target wasm32-wasi	1m 44s
Test on ubuntu-latest	7m 15s
Test on i686-unknown-linux-gnu	13m 10s
Code coverage	3m 36s
Test on i686-unknown-linux-gnu with beta features	13m 32s
Test on windows-latest	11m 12s
Test on i686-unknown-linux-gnu with nightly features	15m 35s
Intra-doc links	1m 34s
Test on macOS-latest	5m 54s
Rustfmt	14s
Test on ubuntu-latest with beta features	7m 21s
Test on windows-latest with beta features	10m 51s
Test on macOS-latest with beta features	5m 53s
Test on ubuntu-latest with nightly features	8m 27s
Test on windows-latest with nightly features	11m 51s
Test on macOS-latest with nightly features	6m 38s
	2h 9m 32s

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