add mailing_list email field on team model

src/teams/migrations/0015_team_mailing_list.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.5 on 2017-07-11 17:39
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('teams', '0014_remove_teammember_deleted'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='team',
+            name='mailing_list',
+            field=models.EmailField(blank=True, max_length=254),
+        ),
+    ]

src/teams/models.py

@@ -47,6 +47,7 @@ class Team(CampRelatedModel):
         related_name='teams',
         through='teams.TeamMember'
     )
+    mailing_list = models.EmailField(blank=True)
 
     def __str__(self):
         return '{} ({})'.format(self.name, self.camp)