build: test both msrv and stable rust #110

Job	Run time
build_with_hash	20s
build (ubuntu-latest, WITH_RUST=ON, 1.64)	2m 35s
build (ubuntu-latest, WITH_RUST=ON, stable)	1m 46s
build (ubuntu-latest, WITH_RUST=OFF, 1.64)	48s
build (windows-latest, WITH_RUST=ON, 1.64)	5m 26s
build (windows-latest, WITH_RUST=ON, stable)	4m 51s
build (windows-latest, WITH_RUST=OFF, 1.64)	3m 10s
build (macos-latest, WITH_RUST=ON, 1.64)	3m 39s
build (macos-latest, WITH_RUST=ON, stable)	3m 7s
build (macos-latest, WITH_RUST=OFF, 1.64)	1m 9s
cargo_test (ubuntu-latest, 1.64)	1m 41s
cargo_test (ubuntu-latest, stable)	42s
cargo_test (windows-latest, 1.64)	2m 43s
cargo_test (windows-latest, stable)	2m 22s
cargo_test (macos-latest, 1.64)	2m 59s
cargo_test (macos-latest, stable)	56s
	38m 14s

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