RELEASES.md: Expand cargo tree note to mention cargo tree -d

[joshtriplett]

Useful feature that people might not automatically associate with cargo tree.

[rust-highfive]

r? @nikomatsakis

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[joshtriplett]

cc @XAMPPRocky

[Mark-Simulacrum]

Hm, I think we generally try to avoid going into too much depth, but on the other hand it does seem like an important use case. Maybe we should include it in the blog post instead? rust-lang/blog.rust-lang.org#604

But I'm not opposed to doing both! I'm interested in hearing thoughts on this - if no one chimes in I'll most likely include this in the stable release.

[joshtriplett]

@Mark-Simulacrum I definitely don't want to go into unnecessary depth, but this is a distinct function people wouldn't ordinarily associate with cargo tree unless they'd used the out-of-tree cargo tree -d command before. One sentence letting people know the functionality exists seems warranted to me.

I think it belongs in the blog post as well: https://github.com/rust-lang/blog.rust-lang.org/pull/604/files#r432983344

[XAMPPRocky]

Looks good to me, more information is better in general imo and this doesn’t get too in the weeds.

[Mark-Simulacrum]

Yeah, I agree it's not obvious that cargo tree can do it.

@bors r+ rollup

[bors]

📌 Commit 3273660 has been approved by Mark-Simulacrum