Add -preview=in information to the changelog

[atilaneves]

No description provided.

[dlang-bot]

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Testing this PR locally

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dub run digger -- build "master + dmd#11003"

[Geod24]

This lacks any context as to why the change was made. An user, on reading this, won't understand why [s]he needs to use it, or what it brings him/her. And we should not assume the user is aware of this switch's connection to DIP1000, either.

[atilaneves]

@Geod24 Good to go?