Support ..= for --version-range #2538

Job	Run time
miri	1m 34s
build (aarch64-unknown-linux-gnu)	2m 1s
build (aarch64-unknown-linux-musl)	1m 39s
build (aarch64-apple-darwin)	2m 1s
build (aarch64-pc-windows-msvc)	2m 48s
build (x86_64-unknown-linux-gnu)	1m 30s
build (x86_64-unknown-linux-musl)	1m 38s
build (x86_64-apple-darwin)	2m 19s
build (x86_64-pc-windows-msvc)	2m 25s
build (x86_64-unknown-freebsd)	1m 58s
test (stable)	6m 37s
test (beta)	8m 16s
test (nightly)	6m 36s
test (nightly, macos-11)	8m 34s
test (nightly, windows-2019)	3m 27s
test (1.26)	10m 59s
test (1.30)	9m 11s
test (1.31)	8m 57s
test (1.36)	9m 41s
test (1.39)	10m 3s
test (1.41)	11m 8s
msrv / msrv	3m 14s
deny / deny	25s
tidy / tidy	1m 3s
	1h 58m 4s

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