Replace Object.assign with module

Author: acdlite

package.json

@@ -19,6 +19,7 @@
     "lodash": "~2.4.1",
     "lodash-node": "~2.4.1",
     "minimist": "~1.1.0",
+    "object-assign": "~2.0.0",
     "through2": "~0.6.3"
   },
   "devDependencies": {

src/jsonSass.js

@@ -2,14 +2,15 @@
 
 import through from 'through2';
 import jsToSassString from './jsToSassString';
+import assign from 'object-assign';
 
 let DEFAULTS = {
   prefix: '',
   suffix: ';',
 };
 
 function jsonSass(options) {
-  let options = Object.assign({}, DEFAULTS, options);
+  let options = assign({}, DEFAULTS, options);
 
   return through(function(chunk, enc, callback) {
     let jsValue = JSON.parse(chunk);