try to fix issue #251

[fogti]

I think that the following modification (seen in quick-error) could work here, to fix issue #251.
I splitted the problematic part in two parts:

1. ignore unknown/renamed/removed lints
2. disable warnings about unused doc comments

[fogti]

tailhook/quick-error@34a67cc

[AndyGauge]

I'm trying to push for a release for some minor changes that have serious impact on users. If you don't mind, I would like to hold off on this one.

[AndyGauge]

Why does splitting the cfgs to separate lines fix the issue?

[fogti]

This fixes an issue with rustc 1.27.0 (and probably 1.28.0, too), which doesn't apply the (#allow) unknown_lints, renamed_and_removed_lints to unused_doc_comment, unused_doc_comments, when these lints-to-ignore are in the same line

[AndyGauge]

Thanks, that was news to me!