ensure double-quoted module references are supported

previously the following was ignored, resulting in puzzling syntax errors:

    import foo from "foo";
    import { bar } from "bar";

index.js

@@ -1,15 +1,15 @@
 var hook = require('node-hook');
 
 hook.hook('.js', (src, name) => {
-  src = src.replace(/import ([^{]*?) from '(.*?)'/g, 'const $1 = require("$2")');
+  src = src.replace(/import ([^{]*?) from ['"](.*?)['"]/g, 'const $1 = require("$2")');
   src = src.replace(/export default ([^ ]*)/g, 'module.exports = $1');
   src = src.replace(/export (var|let|const) ([a-zA-Z0-9_$]*)/g, '$1 $2 = module.exports.$2');
   src = src.replace(/export function ([a-zA-Z0-9_$]*)/g, 'var $1 = module.exports.$1 = function');
   src = src.replace(/export class ([a-zA-Z0-9_$]*)/g, 'var $1 = module.exports.$1 = class');
-  src = src.replace(/import {(.*?)} from '(.*?)'/g, (all, $1, $2) => {
+  src = src.replace(/import {(.*?)} from ['"](.*?)['"]/g, (all, $1, $2) => {
     return $1.split(",")
       .map(part => 'var ' + part + '= require("' + $2 + '").' + part.trim() + ';')
       .join('');
   });
   return src;
-});
+});