ng-sortable moved into other project

[marcbachmann]

The most recent version of this module (v1.5.0) doesn't work anymore with angular 1.x.
The angular module has moved from sortablejs/ng-sortable.js to angular-legacy-sortablejs.

If you're having problems like me, you can replace

require('sortablejs/ng-sortable.js')

with

require('angular-legacy-sortablejs')

Maybe we can document that migration step somewhere.

[marcbachmann]

And the version in master which would work isn't published yet.
@RubaXa would you like to publish that one please ❤️

Here's the relevant fix that is needed: SortableJS/angular-legacy-sortablejs@75af496