Request support for rlm objects

[AndrewCunliffe]

Having recently discovered jtools, I really appreciate the flexibility of your package to facilitate interpretation and reporting of regression models. I'm using robust regression in my analysis, via the rlm function from the MASS package.

Please consider adding support for rlm objects to jtools. I think it should be a quick fix, as it's just a case of changing index positions and dropping non-applicable summary statistics.

Thanks for your good work!