Rust

Add MSRV minimal versions in CI #268

Job	Run time
Style Check (clippy)	56s
Style Checks (rustfmt)	12s
Code Coverage (stable/ubuntu-latest)	3m 41s
README Format Check	1m 10s
Unit and Doc Tests (Rust MSRV on ubuntu-latest)	1m 49s
Unit and Doc Tests (Rust MSRV on windows-latest)	3m 12s
Integration Tests (Rust Stable with curl-client)	49s
Unit and Doc Tests (Rust MSRV on macOS-latest)	1m 26s
Integration Tests (Rust Stable with h1-client)	50s
Unit and Doc Tests (Rust Stable on ubuntu-latest)	18s
Integration Tests (Rust Stable with h1-client-rustls)	56s
Unit and Doc Tests (Rust Stable on windows-latest)	3m 1s
Integration Tests (Rust Stable with hyper-client)	56s
Unit and Doc Tests (Rust Stable on macOS-latest)	29s
Integration Tests (Rust Stable with reqwest-client-rustls)	43s
Unit and Doc Tests (Rust Beta on ubuntu-latest)	30s
Integration Tests (Rust Stable with reqwest-client-native-tls)	28s
Unit and Doc Tests (Rust Beta on windows-latest)	1m 52s
Integration Tests (Rust Stable with reqwest-client-native-tls-vendored)	1m 46s
Unit and Doc Tests (Rust Beta on macOS-latest)	35s
Unit and Doc Tests (Rust Nightly on ubuntu-latest)	24s
Unit and Doc Tests (Rust Nightly on windows-latest)	2m 13s
Unit and Doc Tests (Rust Nightly on macOS-latest)	25s
pages	0s
	28m 41s

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