fix react tutorial link

Author: nishina555

README.md

@@ -2,7 +2,7 @@
 
 # React Tutorial
 
-This is the React comment box example from [the React tutorial](http://facebook.github.io/react/docs/tutorial.html).
+This is the React comment box example from [the React tutorial](https://reactjs.org/tutorial/tutorial.html).
 
 ## To use
 

app.json

@@ -4,7 +4,7 @@
   "keywords": [ "react", "reactjs", "tutorial" ],
   "repository": "https://github.com/reactjs/react-tutorial",
   "logo": "https://facebook.github.io/react/img/logo.svg",
-  "website": "http://facebook.github.io/react/docs/tutorial.html",
+  "website": "https://reactjs.org/tutorial/tutorial.html",
   "success_url": "/",
   "env" : {
     "BUILDPACK_URL": "https://github.com/heroku/heroku-buildpack-nodejs.git"