WISH: Add URL and BugReports

[HenrikBengtsson]

Just dropping by to ask for a URL and BugReports in DESCRIPTION to make it easier to find this repos from CRAN.

[eddelbuettel]

Sure. But please explain to me how having a static URL link to GH helps with CRAN discoverability.

[HenrikBengtsson]

... to find this [GitHub] repos from CRAN.