fix: update the way SortableJS is imported into the library #56
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This is due to a breaking change SortableJS/Sortable#1728, which causes https://github.com/SortableJS/angular-legacy-sortablejs/ to imports SortableJS incorrectly after versions 1.10.0, which leads to it not finding Sortablejs.create.
See:

This fix is obtained from #53, but since the repo seems to now be unmaintained, I've decided to fork that repo to fix that issue.