Add entrypoints

[Menelion]

I'm not very much expert in JavaScript (I'm a backend guy), but I wanted to add Omgopass to a Symfony project using a JS/CSS management tool called AssetMapper. and when I try to add the library, it throws the following error:

  Error 404 checking for a CSS entrypoint for "omgopass". Response: {                                                   
        "status": 404,                                                                                                                                 
        "message": "Couldn't find version 3.2.1 for omgopass. Make sure you use a specific version number, and not a version range or an npm tag."                                                                                              
  }                                                                                                                     

In CommonResponseTrait.php line 170:                                                                                    

  HTTP/1.1 404 Not Found returned for "https://data.jsdelivr.com/v1/packages/npm/omgopass@3.2.1/entrypoints".           

So it's something to do with entry points. This URL indeed shows a 404.
I'm happy to send a PR if I knew what to do.