Allow to send all invoices to a specific email address (#2072)

Co-authored-by: Martin Gross <gross@rami.io>

src/pretix/base/migrations/0186_invoice_sent_to_organizer.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.2 on 2021-05-09 14:48
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0185_memberships'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoice',
+            name='sent_to_organizer',
+            field=models.BooleanField(null=True, default=False),
+            preserve_default=False,
+        ),
+    ]