Reverse dependencies for UPnP

Latest version of the following gems require UPnP

Gem	Version	Date	Downloads
nlhue +9.75 Thousand Downloads	`0.2.0` March 07, 2021	March 07, 2021	9.75 Thousand
UPnP-MediaServer +6.1 Thousand Downloads	`1.0.0` July 23, 2008	July 23, 2008	6.1 Thousand
UPnP-ContentDirectory +5.91 Thousand Downloads	`1.0` July 23, 2008	July 23, 2008	5.91 Thousand
UPnP-ConnectionManager +5.8 Thousand Downloads	`1.0` July 23, 2008	July 23, 2008	5.8 Thousand