<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def emojis(self):
 """Retrieves a dictionary of all of the emojis that GitHub supports. :returns: dictionary where the key is what would be in between the colons and the value is the URL to the image, e.g., :: { } """

        url = self._build_url('emojis')
        return self._json(self._get(url), 200)