Support plugin models

[ayhid]

Currently the plugin only supports melds created directly on strapi.
Sometimes we have models created by third party plugins.

I can make o PR on this if I have some clues where to start.

Thanks a lot for the plugin btw

[wvanooijen92]

@ayhid my comment here may be useful #48 (comment)

I tried to fork but when I installed the plugin locally I got a 405 when I tried exporting, maybe @EdisonPeM knows what is going on with that? I could file a PR if I know how to make that work 😄