Import to Model

[rap2hpoutre]

ON HOLD. See: #13

Currently, it's possible to export from a collection or a model, but only possible to import to collection (not a model). It should be possible, just like this:

$users = (new FastExcel(User::class))->import('file.xlsx');

It should map all columns to existing attributes (declared in fillable property). See #6 for mapping attributes.

[rap2hpoutre]

Done via #13