Prepare for v0.8.1 release #112

Job	Run time
Clippy (ubuntu-latest, stable)	26s
Format (ubuntu-latest, stable)	14s
Clippy (ubuntu-latest, nightly)	1m 5s
Build (ubuntu-latest, stable)	20s
Format (ubuntu-latest, nightly)	56s
Test (ubuntu-latest, stable)	30s
Build (ubuntu-latest, 1.36.0)	1m 56s
Test (ubuntu-latest, 1.56.0)	2m 28s
Build (macos-latest, stable)	15s
Test (macos-latest, stable)	1m 57s
Build (windows-latest, stable)	1m 3s
Cargo Deny (ubuntu-latest, stable)	2m 54s
Test (windows-latest, stable)	2m 10s
Build (windows-latest, 1.36.0)	2m 52s
Test (windows-latest, 1.56.0)	3m 9s
Build (macos-11, 1.36.0)	4m 46s
Test (macos-11, 1.56.0)	4m 10s
	31m 11s

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