Hello,

I would like to display labels for the edges of my network graph.

What would be the easiest way to do that?

Below you can see a small graph with two nodes and one connecting edge as an example. I prepared a test label for the only edge in a dictionary form.

Thanks in advance for any help.

```
import numpy as np
import holoviews as hv
hv.extension('bokeh')
def main():
# create a graph with two nodes and one connecting edge
node_indices = np.arange(2, dtype=np.int32)
source = np.zeros(2, dtype=np.int32)
target = node_indices
graph = hv.Graph(((source, target),))
# edge labels to be set:
edge_label = {(0,1): "test label"}
# save the graph
hv.save(graph, 'graph.html', backend='bokeh')
return
if __name__ == '__main__':
main()
```