Updating Readme.md

Facebook is not providing information like the url, firstname, lastname and location. This is what gets returned when I use omniauth-facebook,


```
--- !ruby/hash:OmniAuth::AuthHash
provider: facebook
uid: '10204324823579719'
info: !ruby/hash:OmniAuth::AuthHash::InfoHash
  email: <email>
  name: Swaathi Kakarla
  image: <image>
credentials: !ruby/hash:OmniAuth::AuthHash
  token: <token>
  expires_at: 1474720216
  expires: true
extra: !ruby/hash:OmniAuth::AuthHash
  raw_info: !ruby/hash:OmniAuth::AuthHash
    name: Swaathi Kakarla
    email: <email>
    id: '10204324823579719'
```

README.md

@@ -83,11 +83,7 @@ Here's an example *Auth Hash* available in `request.env['omniauth.auth']`:
   info: {
     email: 'joe@bloggs.com',
     name: 'Joe Bloggs',
-    first_name: 'Joe',
-    last_name: 'Bloggs',
     image: 'http://graph.facebook.com/1234567/picture?type=square',
-    urls: { Facebook: 'http://www.facebook.com/jbloggs' },
-    location: 'Palo Alto, California',
     verified: true
   },
   credentials: {