Merge pull request #3 from Remexllee/master

miss module in package.json

Author: mrscobbler

002-checkout/package.json

@@ -7,7 +7,8 @@
   },
   "dependencies": {
     "react": "^15.3.2",
-    "react-dom": "^15.3.2"
+    "react-dom": "^15.3.2",
+    "react-addons-css-transition-group": "^15.3.2"
   },
   "scripts": {
     "start": "react-scripts start",