use `resolve-plugins` when done

[tunnckoCore]

tunnckoCore/ideas#67

[tunnckoCore]

will use resolve-plugins-sync by default, but allow passing resolve-plugins (which will be async version).

The difference between them is that latter asynchronously tries to load each plugin from 1) locally, then if not installed locally, so 2) globally.

Where resolve-plugins-sync just uses require.

[tunnckoCore]

#67 is closed, progress here tunnckoCore/ideas#76