Add keyword argument close to function polysmooth

[GiggleLiu]

using Luxor

@drawsvg begin
	background("white")
	polysmooth([Point(0, 0), Point(0, 100), Point(100, 100), Point(100, 0)], 5, :stroke; close=false)
end 300 300

[codecov]

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[cormullion]

Thanks very much! That's some code I haven't seen for a while... :)