Self-Edge Not Shown

[sanbales]

Having an issue not seeing self-edges, also this example below without the edge does not seem to render right now.

May need to add the node sizing constraint to the root node.

from ipyelk.elements import Edge, Label, Node, Port
from ipyelk import from_element


node = Node(labels=[Label(text="Node")])
port1 = Port(
    labels=[Label(text="1")],
    width=10,
    height=10,
)

port2 = Port(
    labels=[Label(text="2")],
    width=10,
    height=10,
)
node.add_port(port1)
node.add_port(port2)

node.add_edge(source=port1, target=port2)

diagram = from_element(node)
diagram

[dfreeman06]