Add support of userId attribute

[coveralls]

Coverage remained the same at 100.0% when pulling d4aa0bcf583006ea2d01b6e9c7466785a90f9ea0 on LubergAlexander:master into 239c7f4e1e40047d346726d339669ef25ea6d55e on joernroeder:master.

[joernroeder]

thanks for adding this feature too! 👍 I've published a new release :)