'help' module specifies Đ.listPackages() instead of Đ.pkgList()

[itdaniher]

line 135 of help.coffee reads as follows:

To view the list of all currently loaded packages and their contents, run #{ dt.symbol() }.listPackages().

pkgMgr.coffee defines "pkgList," with the following description:

"Displays the list of currently loaded packages and their contents."

Seems like just a simple nomenclature mix-up with a one-line fix.

Thanks for such an awesome project!