Prepare for v0.8.0 release #105

Job	Run time
Clippy (ubuntu-latest, stable)	17s
Build (ubuntu-latest, stable)	18s
Cargo Deny (ubuntu-latest, stable)	3m 2s
Clippy (ubuntu-latest, nightly)	18s
Build (ubuntu-latest, 1.36.0)	1m 23s
Format (ubuntu-latest, stable)	12s
Build (macos-latest, stable)	52s
Format (ubuntu-latest, nightly)	12s
Test (ubuntu-latest, stable)	28s
Build (windows-latest, stable)	56s
Test (ubuntu-latest, 1.56.0)	1m 48s
Build (windows-latest, 1.36.0)	2m 16s
Test (macos-latest, stable)	1m 6s
Build (macos-11, 1.36.0)	4m 13s
Test (windows-latest, stable)	1m 22s
Test (windows-latest, 1.56.0)	2m 19s
Test (macos-11, 1.56.0)	3m 7s
	24m 9s

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