Incomplete CSS for 'shopping-bag-alt' or 'shopping-bags'
There is no .bx- css stye for 'shopping-bag-alt' or 'shopping-bags' although .bxs styles exist.


```
.bxs-shopping-bag-alt:before {
  content: "\ee58";
}
.bxs-shopping-bags:before {
  content: "\ee59";
```

however both styles do exist for 'shopping-bag'
```
.bx-shopping-bag:before {
    content: "\ebd0";
}
.bxs-shopping-bag:before {
  content: "\ee57";
}
```