lib: Make RSS feeds ending in "/" be parseable
lib: Make RSS feeds ending in "/" be parseable

They're not directories, we don't know how to handle directories
on HTTP, so don't be silly.

MathieuDuponchelle/totem-pl-parser,pwithnall/totem-pl-parser,pwithnall/totem-pl-parser,MathieuDuponchelle/totem-pl-parser,MathieuDuponchelle/totem-pl-parser,MathieuDuponchelle/totem-pl-parser