Auto merge of #5459 - matklad:more-comments, r=alexcrichton
authorbors <bors@rust-lang.org>
Wed, 2 May 2018 19:03:17 +0000 (19:03 +0000)
committerbors <bors@rust-lang.org>
Wed, 2 May 2018 19:03:17 +0000 (19:03 +0000)
Explain why we need a `Vec<Dependency>` in `Resolve`.

Looks like everyone, who sees it, asks the same question, so let's add an explanation!

cc https://github.com/rust-lang/cargo/pull/5428#issuecomment-385459845


Trivial merge