fix error message formatting, needs to be one line with THREE.warning.

src/renderers/WebGLRenderer.js

@@ -5821,7 +5821,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 			var context = canvas.getContext( '2d' );
 			context.drawImage( image, 0, 0, image.width, image.height, 0, 0, canvas.width, canvas.height );
 
-			THREE.warning( 'THREE.WebGLRenderer:', image, 'is too big (' + image.width + 'x' + image.height + '). Resized to ' + canvas.width + 'x' + canvas.height + '.' );
+			THREE.warning( 'THREE.WebGLRenderer:' + image + 'is too big (' + image.width + 'x' + image.height + '). Resized to ' + canvas.width + 'x' + canvas.height + '.' );
 
 			return canvas;