fix(icons-to-woff): hide "font created" message

Author: jantimon

example/default/dist/styles.css

@@ -10,7 +10,8 @@ module.exports = function createIconFont (icons, options) {
     var fontStream = svgicons2svgfont({
       name: options.name,
       normalize: true,
-      fontHeight: 512
+      fontHeight: 512,
+      log: function () {}
     });
     var svgFont = '';
     fontStream