single quote change to double

Author: helloyou2012

lib/loader.js

@@ -3,7 +3,7 @@
 	Author Tobias Koppers @sokra
 */
 var path = require("path");
-var assign = require('object-assign');
+var assign = require("object-assign");
 var loaderUtils = require("loader-utils");
 var processCss = require("./processCss");
 var getImportPrefix = require("./getImportPrefix");