Merge pull request #425 from zcash/release-0.8.0 #3184

Job	Run time
Bitrot check	1m 53s
Latest build on ubuntu-latest	55s
Latest build on windows-latest	1m 57s
Book tests	16s
Latest build on macOS-latest	1m 48s
Build target wasm32-wasi	1m 18s
Code coverage	7m 42s
Intra-doc links	2m 2s
Rustfmt	13s
Test on ubuntu-latest	7m 53s
Test on windows-latest	9m 21s
Test on macOS-latest	6m 15s
	41m 33s

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