@Ottomic No, you're right.
In fact there is a little to do to make Telemachus work with KSP 1.1
In Visual Studio, just modify the references to the new ksp dll (UnityEngine and Assembly-CSharp) in the !telemachus and Servers projects, and add a reference to the new library KSPUtil in the Telemachus project.
After a rebuild, you just have to copy the Servers.dll and Telemachus.dll files into GameData\Telemachus\Plugins and that's all.
I have to test a little bit more, but it seems to work fine !