Import MSRV stuff from png_pong (#16) #95

Job	Run time
test (ubuntu-latest, 1.70.0)	13s
cross-compile (ubuntu-latest, 1.70.0, aarch64-linux-android)	15s
cross-compile-ios (macos-latest, 1.70.0, aarch64-apple-ios)	19s
test (ubuntu-latest, stable)	6s
cross-compile (ubuntu-latest, 1.70.0, i686-pc-windows-gnu)	19s
test (ubuntu-latest, beta)	12s
cross-compile (ubuntu-latest, 1.70.0, i686-unknown-freebsd)	14s
test (ubuntu-latest, nightly)	1m 20s
cross-compile (ubuntu-latest, 1.70.0, i686-unknown-linux-gnu)	17s
test (macos-latest, 1.70.0)	17s
cross-compile (ubuntu-latest, 1.70.0, wasm32-unknown-unknown)	16s
test (macos-latest, stable)	16s
cross-compile (ubuntu-latest, 1.70.0, x86_64-apple-darwin)	17s
test (macos-latest, beta)	17s
cross-compile (ubuntu-latest, 1.70.0, x86_64-unknown-redox)	14s
test (macos-latest, nightly)	16s
test (windows-latest, 1.70.0)	45s
test (windows-latest, stable)	1m 25s
test (windows-latest, beta)	38s
test (windows-latest, nightly)	46s
	8m 42s

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