Need a tag for the du module to enable easy updates to later versions

[carleeto]

The du folder has its own go.mod file and is therefore a separate module, which means that it cannot be updated based on existing tags.

Therefoure, go get -u github.com/ricochet2200/go-disk-usage/du@v1.1.2 results in the following error:

go get: module github.com/ricochet2200/go-disk-usage@v1.1.2 found, but does not contain package github.com/ricochet2200/go-disk-usage/du

As per the docs, when there are multiple modules in one repository, the tags need to indicate which module is being versioned.

In other words, you would need to add a tag called du/v1.1.2 to allow downstream packages to use the latest du module.