Unapprove automatically when target branch was changed only

[Konstantin Zorin]

Now unapproove does on all changes. But our team uses rebase and squash commands often. And we don't want to use auto unapprove in this case.

But if developer changed target branch (e.g. release -> develop), reviewers have to check changes after rebase on new branch.

Please add settings "Unapprove when target branch was changed".

[Timofey Shklyarov]

yes, we need vice versa, that setting was present to disable this functionality..