update readme

I decided to propose you to add my note, because I could see several issues like:

     AttributeError: InstagramAPI instance has no attribute 'rank_token' 

etc, most probably caused by account issues.

README.md

@@ -11,7 +11,8 @@ Unofficial Instagram API to give you access to ALL Instagram features (like, fol
 This is the Python port of https://github.com/mgp25/Instagram-API which is written in PHP.
 It is still a work in progress to copy all of its API endpoints.
 
-
+NOTE: To successfully parse for a long time you should verify your phone number in your Instagram account. 
+The new fake Instagram account with an unverifird phone number after ~ 1-24 hours could not do any reauests. All requests will be redirected to the page instagram.com/challenge
 
 ### Installation Instructions