Windows CI

Add note about `Char::Reader`'s value semantics #2500

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Run time

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Job	Run time
x86_64-windows-dlls	28s
x86_64-windows-libs	23s
x86_64-windows-llvm	26s
x86_64-windows-release	0s
x86_64-windows / build	6m 27s
x86_64-windows-installer	0s
x86_64-windows-test	34m 34s
	42m 18s