Updated README.md Docker info

Updated Docker run command, because without -it (interactive) switch, kresd would freeze upon startup on [system] interactive mode. That may as well be a defect, but adding -it helps in all cases.
Also updated the URL to the correct address (you'd get redirected automatically, but still).

README.md

@@ -28,10 +28,10 @@ See the [Building project][depends] documentation page for more information.
 This is simple and doesn't require any dependencies or system modifications, just run:
 
 ```
-$ docker run cznic/knot-resolver
+$ docker run -it cznic/knot-resolver
 ```
 
-See the build page [registry.hub.docker.com/u/cznic/knot-resolver](https://registry.hub.docker.com/u/cznic/knot-resolver) for more information and options.
+See the build page [hub.docker.com/u/cznic/knot-resolver](https://hub.docker.com/r/cznic/knot-resolver/) for more information and options.
 
 ### Running