Migrate to new sortorder import path

[fvbommel]

Pull Request description

Due to some issues with the server handling the vanity imports, I unfortunately had to move the vbom.ml/util package to github.com/fvbommel/util. Since I was breaking import paths anyway, I decided to also move the much more popular sortorder sub-package to github.com/fvbommel/sortorder instead.

See fvbommel/util#7

Description of the change

I've updated the import path to the new location.

What I did

I've updated the import path where it was used.

How I did it

I've updated the import path where it was used.

How to verify it

The actual code of the imported package hasn't changed, as can be seen in the Blame view.
The only changes to the .go files have been to remove the vanity import and to remove a test dependency.

Description for the changelog

Updated import path of vbom.ml/util/sortorder to github.com/fvbommel/sortorder

Applicable Issues

None.

[codeclimate]

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[loicalbertin]

LGTM 👍 👏

Thank you very much @fvbommel, that's good to see someone that take care of downstream projects when renaming import paths! 👍

[fvbommel]

Yes, I felt kind of bad about that rename but I think it's the best solution in the long term. Helping out importers is my way of helping ease the pain 😉.