No "drawCircles" option in npm package

[shurfee]

Hi! Thank you for helpful plugin.

Could you please update npm package to include latest changes? This merged pr is not included in npm package: #62

Thank you in advance.

[vovaoecoyc]

Up! When i use method draw by 'mousemove' event, i get some problems with rendering. You can see it in perfomanse tab of chrome dev-tools. This is due to the drawing of the circles.