build

Add CI for minimum dependency versions and fix them #271

Job	Run time
codecov	2m 44s
fmt	42s
build (stable, --features "")	1m 16s
clippy	57s
build (stable, --all-features)	2m 7s
minimal-versions	2m 26s
build (stable, --no-default-features)	38s
semver	1m 21s
build (1.75, --features "")	1m 9s
test	1m 45s
build (1.75, --all-features)	1m 50s
build (1.75, --no-default-features)	32s
build (beta, --features "")	34s
build (beta, --all-features)	2m 30s
build (beta, --no-default-features)	48s
build (nightly, --features "")	1m 12s
build (nightly, --all-features)	1m 50s
build (nightly, --no-default-features)	40s
	25m 1s

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