Fix typo in `Changes.md` #27

Job	Run time
FreeBSD-x86_64 with rust stable	39s
Linux-x86_64 with rust stable	55s
Linux-aarch64 with rust stable	1m 19s
Linux-arm with rust stable	1m 32s
Linux-i686 with rust stable	1m 18s
Linux-powerpc64 with rust stable	1m 20s
Linux-powerpc64le with rust stable	1m 12s
Linux-riscv64 with rust stable	1m 8s
Linux-s390x with rust stable	1m 6s
Windows-aarch64 with rust stable	1m 19s
Windows-i686 with rust stable	2m 2s
Windows-x86_64 with rust stable	3m 16s
macOS-x86_64 with rust stable	31s
macOS-aarch64 with rust stable	31s
Linux-x86_64 with rust beta	1m 7s
Linux-x86_64 with rust nightly	1m 4s
	20m 19s

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