Added minor fix to PolygonVisual
Added minor fix to PolygonVisual

RebeccaWPerry/vispy,hronoses/vispy,drufat/vispy,bollu/vispy,michaelaye/vispy,julienr/vispy,srinathv/vispy,ghisvail/vispy,inclement/vispy,jdreaver/vispy,dchilds7/Deysha-Star-Formation,jay3sh/vispy,jdreaver/vispy,drufat/vispy,jay3sh/vispy,julienr/vispy,RebeccaWPerry/vispy,QuLogic/vispy,inclement/vispy,dchilds7/Deysha-Star-Formation,michaelaye/vispy,sbtlaarzc/vispy,kkuunnddaannkk/vispy,Eric89GXL/vispy,sbtlaarzc/vispy,julienr/vispy,hronoses/vispy,QuLogic/vispy,Eric89GXL/vispy,hronoses/vispy,kkuunnddaannkk/vispy,bollu/vispy,Eric89GXL/vispy,ghisvail/vispy,sh4wn/vispy,kkuunnddaannkk/vispy,sh4wn/vispy,sh4wn/vispy,RebeccaWPerry/vispy,dchilds7/Deysha-Star-Formation,jay3sh/vispy,srinathv/vispy,sbtlaarzc/vispy,QuLogic/vispy,srinathv/vispy,jdreaver/vispy,bollu/vispy,michaelaye/vispy,ghisvail/vispy,drufat/vispy,inclement/vispy