Improve .github/ISSUE_TEMPLATE.md

[kpp]

#567 (comment)

Description

We may improve it by changing or adding these lines to .github/ISSUE_TEMPLATE.md:

$ cargo tree -i -p tokio - show the version of tokio crate only
$ cargo tree -p tokio - show all tokio crates (the subcrates may be useful for debugging too)

[tobz]

I tried both of these commands out, and they give less useful output than the current suggested command. Since they pin to tokio as the root crate, it ignores other tokio crates that are imported discretely.

I'm going to close this because I think the current solution is the most optimal for the time being. If cargo tree had a mode that did grep for you, but also showed dependency tree, that would be most optimal.