make snake case

Author: rmorshea

src/idom/svg.py

@@ -108,7 +108,7 @@
 fe_tile = make_vdom_constructor("feTile", allow_children=False)
 fe_turbulence = make_vdom_constructor("feTurbulence", allow_children=False)
 filter = make_vdom_constructor("filter", allow_children=False)
-foreignObject = make_vdom_constructor("foreignObject", allow_children=False)
+foreign_object = make_vdom_constructor("foreignObject", allow_children=False)
 g = make_vdom_constructor("g")
 hatch = make_vdom_constructor("hatch", allow_children=False)
 hatchpath = make_vdom_constructor("hatchpath", allow_children=False)