npm.commands.bugs(package, callback)
This command tries to guess at the likely location of a package's
bug tracker URL, and then tries to open it using the --browser
config param.
Like other commands, the first parameter is an array. This command only uses the first element, which is expected to be a package name with an optional version number.
This command will launch a browser, so this command may not be the most friendly for programmatic use.