Merge pull request #144 from zcash/output-prover-api-fix #156

Job	Run time
Bitrot check	2m 16s
Clippy (MSRV)	1m 37s
Latest build on ubuntu-latest	50s
Build target wasm32-wasi	1m 45s
Latest build on windows-latest	1m 44s
Intra-doc links	1m 56s
Rustfmt	14s
Latest build on macOS-latest	1m 27s
Test on ubuntu-latest	3m 5s
Test on windows-latest	5m 28s
Test on macOS-latest	2m 44s
	23m 6s

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