docs: Mention history rewriting in README #39

Job	Run time
test (1.22.x)	1m 18s
golangci-lint	1m 15s
test (stable)	1m 15s
build-upload (amd64, windows, windows)	1m 13s
build-upload (amd64, mac, darwin)	1m 10s
build-upload (amd64, linux, linux)	1m 15s
	7m 26s

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