Note in readme about MSRV #2503

Job	Run time
Docs	28s
build_versions (stable)	2m 46s
cargo-deny (aarch64-apple-ios)	17s
build_versions (beta)	16s
Test	46s
build_versions (1.67.0)	32s
cargo-deny (aarch64-linux-android)	21s
Lint	29s
Test (json)	48s
cargo-deny (i686-pc-windows-gnu)	17s
Test (charset)	43s
cargo-deny (i686-pc-windows-msvc)	20s
Test (cookies)	51s
cargo-deny (i686-unknown-linux-gnu)	17s
Test (socks-proxy)	47s
cargo-deny (wasm32-unknown-unknown)	18s
Test (native-certs)	44s
cargo-deny (x86_64-apple-darwin)	20s
Test (gzip)	47s
cargo-deny (x86_64-apple-ios)	19s
Test (brotli)	47s
cargo-deny (x86_64-pc-windows-gnu)	18s
Test (http-crate)	47s
cargo-deny (x86_64-pc-windows-msvc)	17s
Test (http-interop)	47s
cargo-deny (x86_64-unknown-linux-gnu)	17s
Test (http-crate http-interop)	49s
cargo-deny (x86_64-unknown-redox)	17s
Test (tls)	53s
Test (tls, json)	54s
Test (tls, charset)	56s
Test (tls, cookies)	57s
Test (tls, socks-proxy)	54s
Test (tls, native-certs)	55s
Test (tls, gzip)	52s
Test (tls, brotli)	56s
Test (tls, http-crate)	56s
Test (tls, http-interop)	56s
Test (tls, http-crate http-interop)	1m 3s
Test (native-tls)	50s
Test (native-tls, json)	51s
Test (native-tls, charset)	51s
Test (native-tls, cookies)	56s
Test (native-tls, socks-proxy)	51s
Test (native-tls, native-certs)	52s
Test (native-tls, gzip)	55s
Test (native-tls, brotli)	53s
Test (native-tls, http-crate)	52s
Test (native-tls, http-interop)	54s
Test (native-tls, http-crate http-interop)	55s
	36m 37s

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