Add option to use "width: auto" [Library]

@W01F I like the idea! I'm not sure, if that should better be added as Feature Request to the library: https://github.com/Choices-js/Choices/issues
Or does such already exist?

I agree, this should be solved by the library then!

Thanks, so let's postpone this in the library issue. Once created, please link it in the issue summary update @W01F
Thanks!