Test minimal dependency versions in CI #33

Job	Run time
Rustdoc	53s
Rustdoc with `cfg(docsrs)`	46s
Minimal Versions	2m 33s
Clippy	27s
Build	22s
Minimal Versions (`tls-rustls`)	2m 54s
Clippy (`tls-rustls`)	43s
Rustfmt	15s
Build (`tls-rustls`)	40s
Minimal Versions (`tls-rustls-no-provider`)	2m 29s
Clippy (`tls-rustls-no-provider`)	27s
Build (`tls-rustls-no-provider`)	20s
Minimal Versions (`tls-openssl`)	3s
Clippy (`tls-openssl`)	41s
Build (`tls-openssl`)	30s
Minimal Versions (`--all-features`)	5s
Test	34s
Clippy (`--all-features`)	49s
Build (`--all-features`)	39s
Test (`tls-rustls`)	53s
Build MSRV	3m 18s
Test (`rustls/ring`)	39s
Build MSRV (`tls-rustls`)	2m 34s
Test (`tls-openssl`)	42s
Build MSRV (`tls-rustls-no-provider`)	2m 17s
Test (`--all-features`)	1m 2s
Build MSRV (`tls-openssl`)	3m 5s
Build MSRV (`--all-features`)	2m 49s
	33m 29s

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