Modified the example code

The example code was not running. Modified the code to fix the error faced previously

More reference here:  microsoft#494

README.md

@@ -34,17 +34,11 @@ core_client = connection.clients.get_core_client()
 
 # Get the first page of projects
 get_projects_response = core_client.get_projects()
+
 index = 0
-while get_projects_response is not None:
-    for project in get_projects_response.value:
-        pprint.pprint("[" + str(index) + "] " + project.name)
-        index += 1
-    if get_projects_response.continuation_token is not None and get_projects_response.continuation_token != "":
-        # Get the next page of projects
-        get_projects_response = core_client.get_projects(continuation_token=get_projects_response.continuation_token)
-    else:
-        # All projects have been retrieved
-        get_projects_response = None
+for project in get_projects_response:
+    pprint.pprint("[" + str(index) + "] " + project.name)
+    index += 1
 ```
 
 ## API documentation