Add release date to v0.8.0 release #107

Job	Run time
Format (ubuntu-latest, stable)	11s
Test (ubuntu-latest, stable)	28s
Format (ubuntu-latest, nightly)	13s
Cargo Deny (ubuntu-latest, stable)	3m 8s
Build (ubuntu-latest, stable)	19s
Test (ubuntu-latest, 1.56.0)	1m 46s
Build (ubuntu-latest, 1.36.0)	1m 25s
Clippy (ubuntu-latest, stable)	17s
Test (macos-latest, stable)	1m 4s
Clippy (ubuntu-latest, nightly)	18s
Build (macos-latest, stable)	47s
Build (windows-latest, stable)	42s
Test (windows-latest, stable)	1m 16s
Build (windows-latest, 1.36.0)	1m 56s
Test (windows-latest, 1.56.0)	2m 35s
Build (macos-11, 1.36.0)	2m 35s
Test (macos-11, 1.56.0)	3m 0s
	22m 0s

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