Explicitly return Error when GITHUB API rate limit is exceeded

[tintinthong]

Rate limit gets hit for unauthenticated request very easily. The error tho is uninformative, for example.

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/tintinthong/Github/who-unfollowed-me/unfollow/cli.py", line 181, in main
    get_links()
  File "/Users/tintinthong/Github/who-unfollowed-me/unfollow/cli.py", line 84, in get_links
    info = unfollow_main()
  File "/Users/tintinthong/Github/who-unfollowed-me/unfollow/unfollow.py", line 212, in main
    return unfollowed_future.result()
  File "/opt/homebrew/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/concurrent/futures/_base.py", line 451, in result
    return self.__get_result()
  File "/opt/homebrew/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/concurrent/futures/_base.py", line 403, in __get_result
    raise self._exception
  File "/opt/homebrew/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Users/tintinthong/Github/who-unfollowed-me/unfollow/unfollow.py", line 174, in run_unfollow
    unfollows = get_unfollows(username)
  File "/Users/tintinthong/Github/who-unfollowed-me/unfollow/unfollow.py", line 130, in get_unfollows
    get_followers(username, write_file=True)
  File "/Users/tintinthong/Github/who-unfollowed-me/unfollow/unfollow.py", line 90, in get_followers
    write_followers(user_object["login"])
TypeError: string indices must be integers

The CLI should handle a 403 response

{'message': "API rate limit exceeded for 175.136.21.106. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)", 'documentation_url': 
'https://docs.github.com/rest/overview/resources-in-the-rest-api#rate-limiting'}

and raise the Error in a comprehensible so the user knows that the rate limit is exceeded

[tintinthong]

Personally, I also have an opinion about the use of --token flag. I believe the CLI should automatically load the token even if the --token flag is not specified and read from UNFOLLOW_TOKEN. That can be another issue @TechWiz-3 if you want.

[TechWiz-3]

Love this, thanks a lot for making this issue. Would you like to be assigned?

[tintinthong]

Love this, thanks a lot for making this issue. Would you like to be assigned?

Sure sounds good!

[TechWiz-3]

Any updates @tintinthong? No rush, just let me know

[tintinthong]

Any updates @tintinthong? No rush, just let me know

Hi sorry. I will not work on this anymore. Sorry. Thanks for letting me participate in Octoberfest. Cheers!

[TechWiz-3]

👍