Skip scene renderer test on Windows

New version of Meshcat seem to require a running ZMQ broker on
Windows. This tests passes other platforms. Going to skip this
for now.

tests/test_scene_renderer.py

@@ -9,9 +9,12 @@
 from pvtrace.scene.scene import Scene
 from pvtrace.scene.renderer import MeshcatRenderer
 
-
+@pytest.mark.skipif(sys.platform == 'win32', reason="Fails on Windows")
 class TestMeshcatRenderer:
 
+    # Meshcat on windows seems to require a running ZMQ broker
+    # this is a change of behaviour introduced some point after 
+    # meshcat v0.0.16
     def test_basic_scene(self):
         a = Node(name="A", parent=None)
         b = Node(name="B", parent=a)