Update models.py

I can't migrate because haven't related_name='+'

Author: westsaharut

oidc_provider/models.py

@@ -184,7 +184,7 @@ def has_expired(self):
 class Code(BaseCodeTokenModel):
 
     user = models.ForeignKey(
-        settings.AUTH_USER_MODEL, verbose_name=_(u'User'), on_delete=models.CASCADE)
+        settings.AUTH_USER_MODEL, verbose_name=_(u'User'), on_delete=models.CASCADE, related_name='+')
     code = models.CharField(max_length=255, unique=True, verbose_name=_(u'Code'))
     nonce = models.CharField(max_length=255, blank=True, default='', verbose_name=_(u'Nonce'))
     is_authentication = models.BooleanField(default=False, verbose_name=_(u'Is Authentication?'))
@@ -239,7 +239,7 @@ def at_hash(self):
 class UserConsent(BaseCodeTokenModel):
 
     user = models.ForeignKey(
-        settings.AUTH_USER_MODEL, verbose_name=_(u'User'), on_delete=models.CASCADE)
+        settings.AUTH_USER_MODEL, verbose_name=_(u'User'), on_delete=models.CASCADE, related_name='+')
     date_given = models.DateTimeField(verbose_name=_(u'Date Given'))
 
     class Meta: