Add Invites to auditlog

ref #19

src/servala/core/models/organization.py

@@ -2,6 +2,7 @@ import secrets
 
 import rules
 import urlman
+from auditlog.registry import auditlog
 from django.conf import settings
 from django.contrib.sites.shortcuts import get_current_site
 from django.core.mail import send_mail
@@ -536,3 +537,7 @@ The Servala Team"""
             recipient_list=[self.email],
             fail_silently=False,
         )
+
+
+auditlog.register(OrganizationInvitation, serialize_data=True)
+auditlog.register(OrganizationMembership, serialize_data=True)