Added support for line width in shadows

src/renderers/webgl/WebGLShadowMap.js

@@ -369,6 +369,7 @@ THREE.WebGLShadowMap = function ( _renderer, _lights, _objects ) {
 		result.clipShadows = material.clipShadows;
 		result.clippingPlanes = material.clippingPlanes;
 		result.wireframeLinewidth = material.wireframeLinewidth;
+		result.linewidth = material.linewidth;
 
 		if ( isPointLight && result.uniforms.lightPos !== undefined ) {