Reorder import items of a use statement lexicographically.

[sagunb]

Fixes #777

[sezna]

This is awesome, thanks for your contribution! I just left a few comments and questions.

[leviathanbeak]

looking good and thanks for the PR, but there is also this issue #776 would it be too much to ask to include this logic in here instead of removing the whitespace?

[otrho]

Using buffer.join(", ") instead of "," would probably work... removes unnecessary whitespace while putting the right amount back in?

[sagunb]

Using buffer.join(", ") instead of "," would probably work... removes unnecessary whitespace while putting the right amount back in?

done.

[leviathanbeak]

nice, I guess now having a test case (something) like this

use std::hash::{HashMethod,    hash_value,               hash_pair    };

would be useful to confirm that it all works :)

[sagunb]

nice, I guess now having a test case (something) like this

use std::hash::{HashMethod,    hash_value,               hash_pair    };

would be useful to confirm that it all works :)

Done.