Please add the supported UPnP version(s) to the docu (readme)

[funnel20]

The UPnP forum has 3 versions of the Device Architecture. These are:

• 1.0, October 15, 2008, http://upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0.pdf
• 1.0, October 15, 2008, http://upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.1.pdf
• 2.0, February 20, 2008, http://upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v2.0.pdf

Which one(s) is this library compatible with?

[squarefrog]

This uses v1.0, as is shown at the top of the model headers.

All other versions are backwards compatible.