update node modules

node_modules/clean-css/lib/options/optimization-level.js

@@ -31,8 +31,7 @@ DEFAULTS[OptimizationLevel.One] = {
   specialComments: 'all',
   tidyAtRules: true,
   tidyBlockScopes: true,
-  tidySelectors: true,
-  transform: noop
+  tidySelectors: true
 };
 DEFAULTS[OptimizationLevel.Two] = {
   mergeAdjacentRules: true,
@@ -62,15 +61,12 @@ var LIST_VALUE_SEPARATOR = ',';
 var OPTION_SEPARATOR = ';';
 var OPTION_VALUE_SEPARATOR = ':';
 
-function noop() {}
-
 function optimizationLevelFrom(source) {
   var level = override(DEFAULTS, {});
   var Zero = OptimizationLevel.Zero;
   var One = OptimizationLevel.One;
   var Two = OptimizationLevel.Two;
 
-
   if (undefined === source) {
     delete level[Two];
     return level;