Throw AuthException when profile data fetch fails due to checkpoint

[cookieguru]

Q	A
Branch?	master
Bug fix?	no
New feature?	yes
Issue?	N/A

Sometimes Instagram throws up a checkpoint if it feels like media is being downloaded too quickly. Here's what the actual exception looks like:

Instagram\Exception\InstagramFetchException Object
(
    [message:protected] => Error: Client error: `GET https://i.instagram.com/api/v1/users/web_profile_info/?username=pgrimaud` resulted in a `400 Bad Request` response:
{"message":"checkpoint_required","checkpoint_url":"https://i.instagram.com/challenge/?next=/api/v1/users/web_profile_inf (truncated...)

    [string:Exception:private] => 
    [code:protected] => 0
    [[file:protected](file:///protected)] => /path/to/vendor/pgrimaud/instagram-user-feed/src/Instagram/Transport/JsonProfileDataFeedV2.php
    [line:protected] => 28
    [trace:Exception:private] => (not shown in this issue)

Note we cannot see the entire body because the code that generates the exception trims the body to 120 chars