borderWidth is not being used in swarm plot

[benjamintd]

The border width property of a swarm plot is not being used in the component.

To Reproduce
Go to https://nivo.rocks/swarmplot/ and move the borderWidth input. Nothing happens on the graph.

Expected behavior
The border width of the circles is affected by the borderWidth setting.

Screenshots

Cause

The width is hardcoded to 0 here:

nivo/packages/swarmplot/src/SwarmPlot.tsx

Line 144 in 399215b

borderWidth={0}

I suspect this has to do with the use of d3-force which needs to know about the width of the elements.
EDIT: the d3-force positions take the borderWidth into account, so passing down the prop seems to suffice to display the borders. The canvas rendering do not use the borderWidth property, however.

I'll try to submit a PR soon to propose a solution.