Update README for usage of private API

[td391]

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Before submitting an issue, make sure you have:

• Read the README and docs
• Searched the bugtracker for similar issues including closed ones
• Reviewed the sample code in tests and examples

Which client are you using?

• app (instagram_private_api/)
• web (instagram_web_api/)

Purpose of your issue?

• Bug report (encountered problems/errors)
• Feature request (request for a new functionality)
• Question
• Other

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The following sections requests more details for particular types of issues, you can remove any section (the contents between the triple ---) not applicable to your issue.

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Describe your issue

The example of usage of the private API in the README does not work. The dictionary results returned by api.feed_timeline() seems to have been updated.
The following changes in README should work:

@@ -73,11 +73,11 @@ password = 'YOUR_PASSWORD'
 
 api = Client(user_name, password)
 results = api.feed_timeline()
-items = results.get('items', [])
+items = results.get('feed_items', [])
 for item in items:
     # Manually patch the entity to match the public api as closely as possible, optional
     # To automatically patch entities, initialise the Client with auto_patch=True
-    ClientCompatPatch.media(item)
+    media = ClientCompatPatch.media(item['media_or_ad'])
     print(media['code'])

[ping]

Thanks.