Support did-resolver interface

[yannik2002]

Hi,

I noticed that this package uses as a standalone resolveDID() API rather than implementing the did-resolver interface that other DID methods (like did:web, did:ethr) use.

Are there any technical reasons preventing compatability or was this an intentional design choice?

Thanks in advance for your insights!

[swcurran]

@brianorwhatever / @PatStLouis -- comments on this? I'm guessing it was unintentional.

[brianorwhatever]

Not intentional would be easy to implement